!! This breaks support for all arm boards !!
To compile in old style, you must define CONFIG_SYS_ARM_WITHOUT_RELOC or you can compile with "CONFIG_SYS_ARM_WITHOUT_RELOC=1 ./MAKEALL board"
!! This define will be removed soon, so convert your board to use relocation support
Signed-off-by: Heiko Schocher hs@denx.de --- - changes since previous patch set - as introducing CONFIG_SYS_ARM_WITHOUT_RELOC, seperate common arm changes in this patch
arch/arm/config.mk | 8 + arch/arm/include/asm/config.h | 3 +- arch/arm/include/asm/global_data.h | 11 + arch/arm/include/asm/u-boot-arm.h | 14 +- arch/arm/lib/board.c | 468 +++++++++++++++++++++++++++++++++++- arch/arm/lib/cache-cp15.c | 37 +++- arch/arm/lib/interrupts.c | 19 ++- common/cmd_bdinfo.c | 11 +- common/cmd_bmp.c | 6 + common/cmd_i2c.c | 6 + doc/README.arm-relocation | 321 ++++++++++++++++++++++++ nand_spl/nand_boot.c | 7 + nand_spl/nand_boot_fsl_nfc.c | 7 + 13 files changed, 910 insertions(+), 8 deletions(-) create mode 100644 doc/README.arm-relocation
diff --git a/arch/arm/config.mk b/arch/arm/config.mk index e10dafc..6923f6d 100644 --- a/arch/arm/config.mk +++ b/arch/arm/config.mk @@ -33,6 +33,14 @@ STANDALONE_LOAD_ADDR = 0xc100000 endif endif
+ifndef CONFIG_SYS_ARM_WITHOUT_RELOC +# needed for relocation +PLATFORM_RELFLAGS += -fPIC +endif + +ifdef CONFIG_SYS_ARM_WITHOUT_RELOC +PLATFORM_CPPFLAGS += -DCONFIG_SYS_ARM_WITHOUT_RELOC +endif PLATFORM_CPPFLAGS += -DCONFIG_ARM -D__ARM__
# Explicitly specifiy 32-bit ARM ISA since toolchain default can be -mthumb: diff --git a/arch/arm/include/asm/config.h b/arch/arm/include/asm/config.h index b76fd8e..4e8dfd7 100644 --- a/arch/arm/include/asm/config.h +++ b/arch/arm/include/asm/config.h @@ -21,7 +21,8 @@ #ifndef _ASM_CONFIG_H_ #define _ASM_CONFIG_H_
+#if defined(CONFIG_SYS_ARM_WITHOUT_RELOC) /* Relocation to SDRAM works on all ARM boards */ #define CONFIG_RELOC_FIXUP_WORKS - +#endif #endif diff --git a/arch/arm/include/asm/global_data.h b/arch/arm/include/asm/global_data.h index 02cfe45..488bae7 100644 --- a/arch/arm/include/asm/global_data.h +++ b/arch/arm/include/asm/global_data.h @@ -53,6 +53,17 @@ typedef struct global_data { phys_size_t ram_size; /* RAM size */ unsigned long reset_status; /* reset status register at boot */ #endif +#if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC) + unsigned long relocaddr; /* Start address of U-Boot in RAM */ + phys_size_t ram_size; /* RAM size */ + unsigned long mon_len; /* monitor len */ + unsigned long irq_sp; /* irq stack pointer */ + unsigned long start_addr_sp; /* start_addr_stackpointer */ + unsigned long reloc_off; +#if !(defined(CONFIG_SYS_NO_ICACHE) && defined(CONFIG_SYS_NO_DCACHE)) + unsigned long tlb_addr; +#endif +#endif void **jt; /* jump table */ } gd_t;
diff --git a/arch/arm/include/asm/u-boot-arm.h b/arch/arm/include/asm/u-boot-arm.h index 6d2f8bc..faf800a 100644 --- a/arch/arm/include/asm/u-boot-arm.h +++ b/arch/arm/include/asm/u-boot-arm.h @@ -30,11 +30,20 @@ #define _U_BOOT_ARM_H_ 1
/* for the following variables, see start.S */ -extern ulong _armboot_start; /* code start */ extern ulong _bss_start; /* code + data end == BSS start */ extern ulong _bss_end; /* BSS end */ extern ulong IRQ_STACK_START; /* top of IRQ stack */ extern ulong FIQ_STACK_START; /* top of FIQ stack */ +#if defined(CONFIG_SYS_ARM_WITHOUT_RELOC) +extern ulong _armboot_start; /* code start */ +#else +extern ulong _TEXT_BASE; /* code start */ +extern ulong _datarel_start; +extern ulong _datarelrolocal_start; +extern ulong _datarellocal_start; +extern ulong _datarelro_start; +extern ulong IRQ_STACK_START_IN; /* 8 bytes in IRQ stack */ +#endif
/* cpu/.../cpu.c */ int cpu_init(void); @@ -47,6 +56,9 @@ int arch_misc_init(void); /* board/.../... */ int board_init(void); int dram_init (void); +#if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC) +void dram_init_banksize (void); +#endif void setup_serial_tag (struct tag **params); void setup_revision_tag (struct tag **params);
diff --git a/arch/arm/lib/board.c b/arch/arm/lib/board.c index 54519b0..88c6427 100644 --- a/arch/arm/lib/board.c +++ b/arch/arm/lib/board.c @@ -126,7 +126,12 @@ static int init_baudrate (void) { char tmp[64]; /* long enough for environment variables */ int i = getenv_f("baudrate", tmp, sizeof (tmp)); + +#if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC) + gd->baudrate = (i > 0) +#else gd->bd->bi_baudrate = gd->baudrate = (i > 0) +#endif ? (int) simple_strtoul (tmp, NULL, 10) : CONFIG_BAUDRATE;
@@ -137,7 +142,12 @@ static int display_banner (void) { printf ("\n\n%s\n\n", version_string); debug ("U-Boot code: %08lX -> %08lX BSS: -> %08lX\n", - _armboot_start, _bss_start, _bss_end); +#if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC) + _TEXT_BASE, +#else + _armboot_start, +#endif + _bss_start, _bss_end); #ifdef CONFIG_MODEM_SUPPORT debug ("Modem Support enabled\n"); #endif @@ -180,6 +190,7 @@ static int display_dram_config (void) return (0); }
+#if defined(CONFIG_SYS_ARM_WITHOUT_RELOC) #ifndef CONFIG_SYS_NO_FLASH static void display_flash_config (ulong size) { @@ -187,6 +198,7 @@ static void display_flash_config (ulong size) print_size (size, "\n"); } #endif /* CONFIG_SYS_NO_FLASH */ +#endif
#if defined(CONFIG_HARD_I2C) || defined(CONFIG_SOFT_I2C) static int init_func_i2c (void) @@ -234,6 +246,7 @@ typedef int (init_fnc_t) (void);
int print_cpuinfo (void);
+#if defined(CONFIG_SYS_ARM_WITHOUT_RELOC) init_fnc_t *init_sequence[] = { #if defined(CONFIG_ARCH_CPU_INIT) arch_cpu_init, /* basic arch cpu dependent setup */ @@ -444,6 +457,459 @@ extern void davinci_eth_set_mac_addr (const u_int8_t *addr);
/* NOTREACHED - no way out of command loop except booting */ } +#else +void __dram_init_banksize(void) +{ + gd->bd->bi_dram[0].start = CONFIG_SYS_SDRAM_BASE; + gd->bd->bi_dram[0].size = gd->ram_size; +} +void dram_init_banksize(void) + __attribute__((weak, alias("__dram_init_banksize"))); + +init_fnc_t *init_sequence[] = { +#if defined(CONFIG_ARCH_CPU_INIT) + arch_cpu_init, /* basic arch cpu dependent setup */ +#endif +#if defined(CONFIG_BOARD_EARLY_INIT_F) + board_early_init_f, +#endif + timer_init, /* initialize timer */ +#ifdef CONFIG_FSL_ESDHC + get_clocks, +#endif + env_init, /* initialize environment */ + init_baudrate, /* initialze baudrate settings */ + serial_init, /* serial communications setup */ + console_init_f, /* stage 1 init of console */ + display_banner, /* say that we are here */ +#if defined(CONFIG_DISPLAY_CPUINFO) + print_cpuinfo, /* display cpu info (and speed) */ +#endif +#if defined(CONFIG_DISPLAY_BOARDINFO) + checkboard, /* display board info */ +#endif +#if defined(CONFIG_HARD_I2C) || defined(CONFIG_SOFT_I2C) + init_func_i2c, +#endif + dram_init, /* configure available RAM banks */ +#if defined(CONFIG_CMD_PCI) || defined (CONFIG_PCI) + arm_pci_init, +#endif + NULL, +}; + +void board_init_f (ulong bootflag) +{ + bd_t *bd; + init_fnc_t **init_fnc_ptr; + gd_t *id; + ulong addr, addr_sp; + + /* Pointer is writable since we allocated a register for it */ + gd = (gd_t *) (CONFIG_SYS_INIT_SP_ADDR); + /* compiler optimization barrier needed for GCC >= 3.4 */ + __asm__ __volatile__("": : :"memory"); + + memset ((void*)gd, 0, sizeof (gd_t)); + + gd->mon_len = _bss_end - _TEXT_BASE; + + for (init_fnc_ptr = init_sequence; *init_fnc_ptr; ++init_fnc_ptr) { + if ((*init_fnc_ptr)() != 0) { + hang (); + } + } + + debug ("monitor len: %08lX\n", gd->mon_len); + /* + * Ram is setup, size stored in gd !! + */ + debug ("ramsize: %08lX\n", gd->ram_size); +#if defined(CONFIG_SYS_MEM_TOP_HIDE) + /* + * Subtract specified amount of memory to hide so that it won't + * get "touched" at all by U-Boot. By fixing up gd->ram_size + * the Linux kernel should now get passed the now "corrected" + * memory size and won't touch it either. This should work + * for arch/ppc and arch/powerpc. Only Linux board ports in + * arch/powerpc with bootwrapper support, that recalculate the + * memory size from the SDRAM controller setup will have to + * get fixed. + */ + gd->ram_size -= CONFIG_SYS_MEM_TOP_HIDE; +#endif + + addr = CONFIG_SYS_SDRAM_BASE + gd->ram_size; + +#ifdef CONFIG_LOGBUFFER +#ifndef CONFIG_ALT_LB_ADDR + /* reserve kernel log buffer */ + addr -= (LOGBUFF_RESERVE); + debug ("Reserving %dk for kernel logbuffer at %08lx\n", LOGBUFF_LEN, addr); +#endif +#endif + +#ifdef CONFIG_PRAM + /* + * reserve protected RAM + */ + i = getenv_r ("pram", (char *)tmp, sizeof (tmp)); + reg = (i > 0) ? simple_strtoul ((const char *)tmp, NULL, 10) : CONFIG_PRAM; + addr -= (reg << 10); /* size is in kB */ + debug ("Reserving %ldk for protected RAM at %08lx\n", reg, addr); +#endif /* CONFIG_PRAM */ + +#if !(defined(CONFIG_SYS_NO_ICACHE) && defined(CONFIG_SYS_NO_DCACHE)) + /* reserve TLB table */ + addr -= (4096 * 4); + + /* round down to next 64 kB limit */ + addr &= ~(0x10000 - 1); + + gd->tlb_addr = addr; + debug ("TLB table at: %08lx\n", addr); +#endif + + /* round down to next 4 kB limit */ + addr &= ~(4096 - 1); + debug ("Top of RAM usable for U-Boot at: %08lx\n", addr); + +#ifdef CONFIG_VFD +# ifndef PAGE_SIZE +# define PAGE_SIZE 4096 +# endif + /* + * reserve memory for VFD display (always full pages) + */ + addr -= vfd_setmem (addr); + gd->fb_base = addr; +#endif /* CONFIG_VFD */ + +#ifdef CONFIG_LCD + /* reserve memory for LCD display (always full pages) */ + addr = lcd_setmem (addr); + gd->fb_base = addr; +#endif /* CONFIG_LCD */ + + /* + * reserve memory for U-Boot code, data & bss + * round down to next 4 kB limit + */ + addr -= gd->mon_len; + addr &= ~(4096 - 1); + + debug ("Reserving %ldk for U-Boot at: %08lx\n", gd->mon_len >> 10, addr); + +#ifndef CONFIG_PRELOADER + /* + * reserve memory for malloc() arena + */ + addr_sp = addr - TOTAL_MALLOC_LEN; + debug ("Reserving %dk for malloc() at: %08lx\n", + TOTAL_MALLOC_LEN >> 10, addr_sp); + /* + * (permanently) allocate a Board Info struct + * and a permanent copy of the "global" data + */ + addr_sp -= sizeof (bd_t); + bd = (bd_t *) addr_sp; + gd->bd = bd; + debug ("Reserving %zu Bytes for Board Info at: %08lx\n", + sizeof (bd_t), addr_sp); + addr_sp -= sizeof (gd_t); + id = (gd_t *) addr_sp; + debug ("Reserving %zu Bytes for Global Data at: %08lx\n", + sizeof (gd_t), addr_sp); + + /* setup stackpointer for exeptions */ + gd->irq_sp = addr_sp; +#ifdef CONFIG_USE_IRQ + addr_sp -= (CONFIG_STACKSIZE_IRQ+CONFIG_STACKSIZE_FIQ); + debug ("Reserving %zu Bytes for IRQ stack at: %08lx\n", + CONFIG_STACKSIZE_IRQ+CONFIG_STACKSIZE_FIQ, addr_sp); +#endif + /* leave 3 words for abort-stack */ + addr_sp -= 3; + + /* 8-byte alignment for ABI compliance */ + addr_sp &= ~0x07; +#else + addr_sp += 128; /* leave 32 words for abort-stack */ + gd->irq_sp = addr_sp; +#endif + + debug ("New Stack Pointer is: %08lx\n", addr_sp); + +#ifdef CONFIG_POST + post_bootmode_init(); + post_run (NULL, POST_ROM | post_bootmode_get(0)); +#endif + + gd->bd->bi_baudrate = gd->baudrate; + /* Ram ist board specific, so move it to board code ... */ + dram_init_banksize(); + display_dram_config(); /* and display it */ + + gd->relocaddr = addr; + gd->start_addr_sp = addr_sp; + gd->reloc_off = addr - _TEXT_BASE; + debug ("relocation Offset is: %08lx\n", gd->reloc_off); + memcpy (id, (void *)gd, sizeof (gd_t)); + + relocate_code (addr_sp, id, addr); + + /* NOTREACHED - relocate_code() does not return */ +} + +#if !defined(CONFIG_SYS_NO_FLASH) +static char *failed = "*** failed ***\n"; +#endif + +/************************************************************************ + * + * This is the next part if the initialization sequence: we are now + * running from RAM and have a "normal" C environment, i. e. global + * data can be written, BSS has been cleared, the stack size in not + * that critical any more, etc. + * + ************************************************************************ + */ +void board_init_r (gd_t *id, ulong dest_addr) +{ + char *s; + bd_t *bd; + ulong malloc_start; +#if !defined(CONFIG_SYS_NO_FLASH) + ulong flash_size; +#endif +#if !defined(CONFIG_RELOC_FIXUP_WORKS) + extern void malloc_bin_reloc (void); +#if defined(CONFIG_CMD_BMP) + extern void bmp_reloc(void); +#endif +#if defined(CONFIG_CMD_I2C) + extern void i2c_reloc(void); +#endif +#endif + + gd = id; + bd = gd->bd; + + gd->flags |= GD_FLG_RELOC; /* tell others: relocation done */ + + monitor_flash_len = _bss_start - _TEXT_BASE; + debug ("monitor flash len: %08lX\n", monitor_flash_len); + board_init(); /* Setup chipselects */ + +#ifdef CONFIG_SERIAL_MULTI + serial_initialize(); +#endif + + debug ("Now running in RAM - U-Boot at: %08lx\n", dest_addr); + +#if !defined(CONFIG_RELOC_FIXUP_WORKS) + /* + * We have to relocate the command table manually + */ + fixup_cmdtable(&__u_boot_cmd_start, + (ulong)(&__u_boot_cmd_end - &__u_boot_cmd_start)); +#if defined(CONFIG_CMD_BMP) + bmp_reloc(); +#endif +#if defined(CONFIG_CMD_I2C) + i2c_reloc(); +#endif +#endif /* !defined(CONFIG_RELOC_FIXUP_WORKS) */ + +#ifdef CONFIG_LOGBUFFER + logbuff_init_ptrs (); +#endif +#ifdef CONFIG_POST + post_output_backlog (); +#ifndef CONFIG_RELOC_FIXUP_WORKS + post_reloc (); +#endif +#endif + + /* The Malloc area is immediately below the monitor copy in DRAM */ + malloc_start = dest_addr - TOTAL_MALLOC_LEN; + mem_malloc_init (malloc_start, TOTAL_MALLOC_LEN); +#if !defined(CONFIG_RELOC_FIXUP_WORKS) + malloc_bin_reloc (); +#endif + +#if !defined(CONFIG_SYS_NO_FLASH) + puts ("FLASH: "); + + if ((flash_size = flash_init ()) > 0) { +# ifdef CONFIG_SYS_FLASH_CHECKSUM + print_size (flash_size, ""); + /* + * Compute and print flash CRC if flashchecksum is set to 'y' + * + * NOTE: Maybe we should add some WATCHDOG_RESET()? XXX + */ + s = getenv ("flashchecksum"); + if (s && (*s == 'y')) { + printf (" CRC: %08X", + crc32 (0, (const unsigned char *) CONFIG_SYS_FLASH_BASE, flash_size) + ); + } + putc ('\n'); +# else /* !CONFIG_SYS_FLASH_CHECKSUM */ + print_size (flash_size, "\n"); +# endif /* CONFIG_SYS_FLASH_CHECKSUM */ + } else { + puts (failed); + hang (); + } +#endif + +#if defined(CONFIG_CMD_NAND) + puts ("NAND: "); + nand_init(); /* go init the NAND */ +#endif + +#if defined(CONFIG_CMD_ONENAND) + onenand_init(); +#endif + +#ifdef CONFIG_HAS_DATAFLASH + AT91F_DataflashInit(); + dataflash_print_info(); +#endif + + /* initialize environment */ + env_relocate (); + +#ifdef CONFIG_VFD + /* must do this after the framebuffer is allocated */ + drv_vfd_init(); +#endif /* CONFIG_VFD */ + + /* IP Address */ + gd->bd->bi_ip_addr = getenv_IPaddr ("ipaddr"); + + stdio_init (); /* get the devices list going. */ + + jumptable_init (); + +#if defined(CONFIG_API) + /* Initialize API */ + api_init (); +#endif + + console_init_r (); /* fully init console as a device */ + +#if defined(CONFIG_ARCH_MISC_INIT) + /* miscellaneous arch dependent initialisations */ + arch_misc_init (); +#endif +#if defined(CONFIG_MISC_INIT_R) + /* miscellaneous platform dependent initialisations */ + misc_init_r (); +#endif + + /* set up exceptions */ + interrupt_init (); + /* enable exceptions */ + enable_interrupts (); + + /* Perform network card initialisation if necessary */ +#ifdef CONFIG_DRIVER_TI_EMAC + /* XXX: this needs to be moved to board init */ +extern void davinci_eth_set_mac_addr (const u_int8_t *addr); + if (getenv ("ethaddr")) { + uchar enetaddr[6]; + eth_getenv_enetaddr("ethaddr", enetaddr); + davinci_eth_set_mac_addr(enetaddr); + } +#endif + +#if defined(CONFIG_DRIVER_SMC91111) || defined (CONFIG_DRIVER_LAN91C96) + /* XXX: this needs to be moved to board init */ + if (getenv ("ethaddr")) { + uchar enetaddr[6]; + eth_getenv_enetaddr("ethaddr", enetaddr); + smc_set_mac_addr(enetaddr); + } +#endif /* CONFIG_DRIVER_SMC91111 || CONFIG_DRIVER_LAN91C96 */ + + /* Initialize from environment */ + if ((s = getenv ("loadaddr")) != NULL) { + load_addr = simple_strtoul (s, NULL, 16); + } +#if defined(CONFIG_CMD_NET) + if ((s = getenv ("bootfile")) != NULL) { + copy_filename (BootFile, s, sizeof (BootFile)); + } +#endif + +#ifdef BOARD_LATE_INIT + board_late_init (); +#endif + +#ifdef CONFIG_GENERIC_MMC + puts ("MMC: "); + mmc_initialize (gd->bd); +#endif + +#ifdef CONFIG_BITBANGMII + bb_miiphy_init(); +#endif +#if defined(CONFIG_CMD_NET) +#if defined(CONFIG_NET_MULTI) + puts ("Net: "); +#endif + eth_initialize(gd->bd); +#if defined(CONFIG_RESET_PHY_R) + debug ("Reset Ethernet PHY\n"); + reset_phy(); +#endif +#endif + +#ifdef CONFIG_POST + post_run (NULL, POST_RAM | post_bootmode_get(0)); +#endif + +#if defined(CONFIG_PRAM) || defined(CONFIG_LOGBUFFER) + /* + * Export available size of memory for Linux, + * taking into account the protected RAM at top of memory + */ + { + ulong pram; + uchar memsz[32]; +#ifdef CONFIG_PRAM + char *s; + + if ((s = getenv ("pram")) != NULL) { + pram = simple_strtoul (s, NULL, 10); + } else { + pram = CONFIG_PRAM; + } +#else + pram=0; +#endif +#ifdef CONFIG_LOGBUFFER +#ifndef CONFIG_ALT_LB_ADDR + /* Also take the logbuffer into account (pram is in kB) */ + pram += (LOGBUFF_LEN+LOGBUFF_OVERHEAD)/1024; +#endif +#endif + sprintf ((char *)memsz, "%ldk", (bd->bi_memsize / 1024) - pram); + setenv ("mem", (char *)memsz); + } +#endif + + /* main_loop() can return to retry autoboot, if so just run it again. */ + for (;;) { + main_loop (); + } + + /* NOTREACHED - no way out of command loop except booting */ +} +#endif /* defined(CONFIG_SYS_ARM_WITHOUT_RELOC) */
void hang (void) { diff --git a/arch/arm/lib/cache-cp15.c b/arch/arm/lib/cache-cp15.c index b2811f3..fe6d459 100644 --- a/arch/arm/lib/cache-cp15.c +++ b/arch/arm/lib/cache-cp15.c @@ -44,17 +44,44 @@ static void cp_delay (void) asm volatile("" : : : "memory"); }
-/* to activate the MMU we need to set up virtual memory: use 1M areas in bss */ +#if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC) +static inline void dram_bank_mmu_setup(int bank) +{ + u32 *page_table = (u32 *)gd->tlb_addr; + bd_t *bd = gd->bd; + int i; + + debug("%s: bank: %d\n", __func__, bank); + for (i = bd->bi_dram[bank].start >> 20; + i < (bd->bi_dram[bank].start + bd->bi_dram[bank].size) >> 20; + i++) { + page_table[i] = i << 20 | (3 << 10) | CACHE_SETUP; + } +} +#endif + +/* to activate the MMU we need to set up virtual memory: use 1M areas */ static inline void mmu_setup(void) { +#if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC) + u32 *page_table = (u32 *)gd->tlb_addr; +#else static u32 __attribute__((aligned(16384))) page_table[4096]; bd_t *bd = gd->bd; - int i, j; + int j; +#endif + int i; u32 reg;
/* Set up an identity-mapping for all 4GB, rw for everyone */ for (i = 0; i < 4096; i++) page_table[i] = i << 20 | (3 << 10) | 0x12; + +#if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC) + for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) { + dram_bank_mmu_setup(i); + } +#else /* Then, enable cacheable and bufferable for RAM only */ for (j = 0; j < CONFIG_NR_DRAM_BANKS; j++) { for (i = bd->bi_dram[j].start >> 20; @@ -63,6 +90,7 @@ static inline void mmu_setup(void) page_table[i] = i << 20 | (3 << 10) | CACHE_SETUP; } } +#endif
/* Copy the page table address to cp15 */ asm volatile("mcr p15, 0, %0, c2, c0, 0" @@ -74,7 +102,6 @@ static inline void mmu_setup(void) reg = get_cr(); /* get control reg. */ cp_delay(); set_cr(reg | CR_M); - }
/* cache_bit must be either CR_I or CR_C */ @@ -96,6 +123,10 @@ static void cache_disable(uint32_t cache_bit) uint32_t reg;
if (cache_bit == CR_C) { + /* if cache isn;t enabled no need to disable */ + reg = get_cr(); + if ((reg & CR_C) != CR_C) + return; /* if disabling data cache, disable mmu too */ cache_bit |= CR_M; flush_cache(0, ~0); diff --git a/arch/arm/lib/interrupts.c b/arch/arm/lib/interrupts.c index 1f2b815..9a21e7b 100644 --- a/arch/arm/lib/interrupts.c +++ b/arch/arm/lib/interrupts.c @@ -38,15 +38,20 @@ #include <common.h> #include <asm/proc-armv/ptrace.h>
-#ifdef CONFIG_USE_IRQ DECLARE_GLOBAL_DATA_PTR;
+#ifdef CONFIG_USE_IRQ int interrupt_init (void) { /* * setup up stacks if necessary */ +#if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC) + IRQ_STACK_START = gd->irq_sp - 4; + IRQ_STACK_START_IN = gd->irq_sp + 8; +#else IRQ_STACK_START = _armboot_start - CONFIG_SYS_MALLOC_LEN - CONFIG_SYS_GBL_DATA_SIZE - 4; +#endif FIQ_STACK_START = IRQ_STACK_START - CONFIG_STACKSIZE_IRQ;
return arch_interrupt_init(); @@ -81,6 +86,18 @@ int disable_interrupts (void) return (old & 0x80) == 0; } #else +#if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC) +int interrupt_init (void) +{ + /* + * setup up stacks if necessary + */ + IRQ_STACK_START_IN = gd->irq_sp + 8; + + return 0; +} +#endif + void enable_interrupts (void) { return; diff --git a/common/cmd_bdinfo.c b/common/cmd_bdinfo.c index cc81543..4c3040a 100644 --- a/common/cmd_bdinfo.c +++ b/common/cmd_bdinfo.c @@ -343,7 +343,16 @@ int do_bdinfo ( cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) printf ("ip_addr = %pI4\n", &bd->bi_ip_addr); #endif printf ("baudrate = %d bps\n", bd->bi_baudrate); - +#if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC) +#if !(defined(CONFIG_SYS_NO_ICACHE) && defined(CONFIG_SYS_NO_DCACHE)) + print_num ("TLB addr", gd->tlb_addr); +#endif + print_num ("relocaddr", gd->relocaddr); + print_num ("reloc off", gd->reloc_off); + print_num ("irq_sp", gd->irq_sp); /* irq stack pointer */ + print_num ("sp start ", gd->start_addr_sp); + print_num ("FB base ", gd->fb_base); +#endif return 0; }
diff --git a/common/cmd_bmp.c b/common/cmd_bmp.c index d51cc55..6fa8a15 100644 --- a/common/cmd_bmp.c +++ b/common/cmd_bmp.c @@ -137,6 +137,12 @@ static cmd_tbl_t cmd_bmp_sub[] = { U_BOOT_CMD_MKENT(display, 5, 0, do_bmp_display, "", ""), };
+#ifndef CONFIG_RELOC_FIXUP_WORKS +void bmp_reloc(void) { + fixup_cmdtable(cmd_bmp_sub, ARRAY_SIZE(cmd_bmp_sub)); +} +#endif + /* * Subroutine: do_bmp * diff --git a/common/cmd_i2c.c b/common/cmd_i2c.c index 5e9135e..48de54b 100644 --- a/common/cmd_i2c.c +++ b/common/cmd_i2c.c @@ -1287,6 +1287,12 @@ static cmd_tbl_t cmd_i2c_sub[] = { U_BOOT_CMD_MKENT(speed, 1, 1, do_i2c_bus_speed, "", ""), };
+#ifndef CONFIG_RELOC_FIXUP_WORKS +void i2c_reloc(void) { + fixup_cmdtable(cmd_i2c_sub, ARRAY_SIZE(cmd_i2c_sub)); +} +#endif + static int do_i2c(cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[]) { cmd_tbl_t *c; diff --git a/doc/README.arm-relocation b/doc/README.arm-relocation new file mode 100644 index 0000000..6be1a12 --- /dev/null +++ b/doc/README.arm-relocation @@ -0,0 +1,321 @@ +To make relocation on arm working, the following changes are done: + +Add new compilerflag: + +-fPIC + + -> compiler generates position independent code + +changes in board code: + +- dram_init: + - bd pointer is now at this point not accessible, so only + detect the real dramsize, and store it in gd->ram_size. + best detected with get_ram_size(); + ToDo: move there also the dram initialization on boards where + it is possible. + - setup the bd_t dram bank info in the new function + dram_init_banksize(). + +- board.c code is adapted from ppc code + +- undef CONFIG_RELOC_FIXUP_WORKS + + -> cmdtabl, and subcommand table must be handled from "hand" + collected in section "__datarellocal_start". + + - How To fixup the sections: + + __datarel_start, __datarelrolocal_start, __datarellocal_start and + __datarelro_start + + automatically? Then it should be possible to define again + CONFIG_RELOC_FIXUP_WORKS + +- irq stack setup is now not longer on a fix position, instead it is + calculated in board_init_f, and stored in gd->irq_sp + +------------------------------------------------------------------------------------- + +To compile a board without relocation, define CONFIG_SYS_ARM_WITHOUT_RELOC +This possibility will removed!! So please fix your board to compile without +CONFIG_SYS_ARM_WITHOUT_RELOC defined!!! + +------------------------------------------------------------------------------------- + +ToDo: + +- fill in bd_t infos (check) +- adapt all boards + +- maybe adapt TEXT_BASE (this must be checked from board maintainers) + This *must* be done for boards, which boot from NOR flash + + on other boards if TEXT_BASE = relocation baseaddr, this saves + one copying from u-boot code. + +- new function dram_init_banksize() is actual board specific. Maybe + we make a weak default function in arch/arm/lib/board.c ? + +------------------------------------------------------------------------------------- + +Relocation with NAND_SPL (example for the tx25): + +- cpu copies the first page from NAND to 0xbb000000 (IMX_NFC_BASE) + and start with code execution on this address. + +- The First page contains u-boot code from u-boot:nand_spl/nand_boot_fsl_nfc.c + which inits the dram, cpu registers, reloacte itself to TEXT_BASE and loads + the "real" u-boot to CONFIG_SYS_NAND_U_BOOT_DST and starts execution + @CONFIG_SYS_NAND_U_BOOT_START + +- This u-boot does no ram int, nor cpu register setup. Just looks + where it have to relocate and relocate itself to this address. + If relocate address = TEXT_BASE(not the same, as the TEXT_BASE + from the nand_spl code), no need to copy, just go on with bss clear + and jump to board_init_r. + +------------------------------------------------------------------------------------- + +Relocation: +How to translate flash addresses in GOT to ram addresses. +This is automagically done from code, but this example +shows, how this magic code works ;-) +(example on the qong board) + +Find a variable: + +a) search it in System.map +(for example flash_info) + +a005b4c0 B BootpID +a005b4c4 B BootpTry +a005b4c8 b slave +a005b4cc B flash_info +^^^^^^^^ +a005c908 b saved_sector.4002 +a005c910 b cfi_mtd_info +a005c9c0 b cfi_mtd_names +a005c9d0 B mtd_table + +--------------------------------------- + +b) create hexdump from u-boot code: + +hexdump -C u-boot > gnlmpfhex + +--------------------------------------- + +c) search the variables address in the hexdump + + +* +0005fc80 00 00 00 00 00 00 00 00 2c 06 01 a0 18 cd 05 a0 |........,.......| +0005fc90 9c d4 05 a0 bc b4 05 a0 1c 7f 05 a0 f0 05 01 a0 |................| +0005fca0 08 5a 04 a0 1c ab 05 a0 ec a4 05 a0 98 c3 01 a0 |.Z..............| +0005fcb0 a0 d6 05 a0 04 71 05 a0 c0 f9 00 a0 3c cd 05 a0 |.....q......<...| +0005fcc0 cc b4 05 a0 f0 fa 00 a0 f0 d6 05 a0 10 86 05 a0 |................| + ^^^^^^^^^^^ +0005fcd0 a4 16 06 a0 dc 64 05 a0 18 86 05 a0 52 48 05 a0 |.....d......RH..| +0005fce0 c0 86 05 a0 24 6e 02 a0 b4 6c 05 a0 b0 94 01 a0 |....$n...l......| +0005fcf0 1c 86 05 a0 50 85 05 a0 d4 0c 06 a0 bc 0b 06 a0 |....P...........| + + +-> 0005fcc0 + +---------------------------------------- + +d) know we calculate this address in RAM + + + 8ff08000 (new address of code in RAM *1) + ++ 0005fcc0 + +- 00008000 (offset of text *2) + +---------- + + 8ff5fcc0 -> Addr GOT in RAM + +*1: +activate debug and look for the line: +Now running in RAM - U-Boot at: 8ff08000 + ^^^^^^^^ + new address of u-boot code in RAM + +*2: +Section Headers: + [Nr] Name Type Addr Off Size ES Flg Lk Inf Al + [ 0] NULL 00000000 000000 000000 00 0 0 0 + [ 1] .text PROGBITS a0000000 008000 04599c 00 AX 0 0 32 + ^^^^^^ + Offset of text + +---------------------------------------- + +e) now we look in 8ff5fcc0 (RAM) + + +QongEVB>md 0x8ff5fcc0 +8ff5fcc0 : a005b4cc a000faf0 a005d6f0 a0058610 ................ + ^^^^^^^^ + Bingo, here we have the old flash address (when relocation + is working, here is the fixed ram address. see @ f, how + it gets calculated) + + +---------------------------------------- + +f) now translate it in the new RAM address + + a005b4cc + +- a0000000 TextBase + ++ 8ff08000 new address of u-boot in ram +---------- + 8ff634cc + +QongEVB>mm 0x8ff5fcc0 0x8ff634cc 1 +QongEVB>md 0x8ff5fcc0 +8ff5fcc0 : 8ff634cc a000faf0 a005d6f0 a0058610 .4.............. +8ff5fcd0 : a00616a4 a00564dc a0058618 a0054852 .....d......RH.. + +As this must be done for all address in the GOT, the u-boot +code did this automagically ... :-) + +---------------------------------------------- + +g) check if the new address is really in the bss section: + +bss start: +8ff6054c (8ff08000 + 0005854C monitorlen) + +bss end: +8ff698ac (8ff08000 + 618AC) + +8ff634cc is in bss :-) + +---------------------------------------------- + +h) u-boot prints: + +important addresses: + +U-Boot code: A0000000 -> A005854C BSS: -> A00618AC TextBase 0xa0000000 +Now running in RAM - U-Boot at: 8ff08000 relocBase 0x8ff08000 + + +--------- + +U-Boot 2010.06-rc2-00002-gf8fbb25-dirty (Jun 18 2010 - 17:07:19) + +U-Boot code: A0000000 -> A005854C BSS: -> A00618AC +CPU: Freescale i.MX31 at 398 MHz +Board: DAVE/DENX Qong +mon: FFFFFFFF gd->monLen: 000618AC +Top of RAM usable for U-Boot at: 90000000 +LCD panel info: 640 x 480, 16 bit/pix +Reserving 600k for LCD Framebuffer at: 8ff6a000 +Reserving 390k for U-Boot at: 8ff08000 +Reserving 1280k for malloc() at: 8fdc8000 +Reserving 28 Bytes for Board Info at: 8fdc7fe4 +Reserving 48 Bytes for Global Data at: 8fdc7fb4 +New Stack Pointer is: 8fdc7fb0 +RAM Configuration: +Bank #0: 80000000 256 MiB +mon: 0005854C gd->monLen: 000618AC +Now running in RAM - U-Boot at: 8ff08000 + +------------------------------------------------------------------------------------- + +Debugging u-boot in RAM: +(example on the qong board) + +a) add in config.mk: + +PLATFORM_CPPFLAGS += -DDEBUG + +----------------- + +b) start debugger + +arm-linux-gdb u-boot + +[hs@pollux u-boot]$ arm-linux-gdb u-boot +GNU gdb Red Hat Linux (6.7-2rh) +Copyright (C) 2007 Free Software Foundation, Inc. +License GPLv3+: GNU GPL version 3 or later http://gnu.org/licenses/gpl.html +This is free software: you are free to change and redistribute it. +There is NO WARRANTY, to the extent permitted by law. Type "show copying" +and "show warranty" for details. +This GDB was configured as "--host=i686-pc-linux-gnu --target=arm-linux". +The target architecture is set automatically (currently arm) +.. +(gdb) + +----------------- + +c) connect to target + +target remote bdi10:2001 + +(gdb) target remote bdi10:2001 +Remote debugging using bdi10:2001 +0x8ff17f10 in ?? () +(gdb) + +----------------- + +d) discard symbol-file + +(gdb) symbol-file +Discard symbol table from `/home/hs/celf/u-boot/u-boot'? (y or n) y +No symbol file now. +(gdb) + +----------------- + +e) load new symbol table: + +(gdb) add-symbol-file u-boot 0x8ff08000 +add symbol table from file "u-boot" at + .text_addr = 0x8ff08000 +(y or n) y +Reading symbols from /home/hs/celf/u-boot/u-boot...done. +(gdb) c +Continuing. +^C +Program received signal SIGSTOP, Stopped (signal). +0x8ff17f18 in serial_getc () at serial_mxc.c:192 +192 while (__REG(UART_PHYS + UTS) & UTS_RXEMPTY); +(gdb) + +add-symbol-file u-boot 0x8ff08000 + ^^^^^^^^^^ + get this address from u-boot debug printfs + +U-Boot 2010.06-rc2-00009-gf77b8b8-dirty (Jun 22 2010 - 09:43:46) + +U-Boot code: A0000000 -> A0058BAC BSS: -> A0061F10 +CPU: Freescale i.MX31 at 398 MHz +Board: DAVE/DENX Qong +mon: FFFFFFFF gd->monLen: 00061F10 +Top of RAM usable for U-Boot at: 90000000 +LCD panel info: 640 x 480, 16 bit/pix +Reserving 600k for LCD Framebuffer at: 8ff6a000 +Reserving 391k for U-Boot at: 8ff08000 + ^^^^^^^^ +Reserving 1280k for malloc() at: 8fdc8000 +Reserving 24 Bytes for Board Info at: 8fdc7fe8 +Reserving 52 Bytes for Global Data at: 8fdc7fb4 +New Stack Pointer is: 8fdc7fb0 +RAM Configuration: +Bank #0: 80000000 256 MiB +relocation Offset is: eff08000 +mon: 00058BAC gd->monLen: 00061F10 +Now running in RAM - U-Boot at: 8ff08000 + ^^^^^^^^ + +Now you can use gdb as usual :-) diff --git a/nand_spl/nand_boot.c b/nand_spl/nand_boot.c index b9fd6f5..18ecbe1 100644 --- a/nand_spl/nand_boot.c +++ b/nand_spl/nand_boot.c @@ -221,6 +221,13 @@ static int nand_load(struct mtd_info *mtd, unsigned int offs, return 0; }
+#if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC) +void board_init_f (ulong bootflag) +{ + relocate_code (TEXT_BASE - TOTAL_MALLOC_LEN, NULL, TEXT_BASE); +} +#endif + /* * The main entry for NAND booting. It's necessary that SDRAM is already * configured and available since this code loads the main U-Boot image diff --git a/nand_spl/nand_boot_fsl_nfc.c b/nand_spl/nand_boot_fsl_nfc.c index ea3566b..3105657 100644 --- a/nand_spl/nand_boot_fsl_nfc.c +++ b/nand_spl/nand_boot_fsl_nfc.c @@ -263,6 +263,13 @@ static int nand_load(unsigned int from, unsigned int size, unsigned char *buf) return 0; }
+#if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC) +void board_init_f (ulong bootflag) +{ + relocate_code (TEXT_BASE - TOTAL_MALLOC_LEN, NULL, TEXT_BASE); +} +#endif + /* * The main entry for NAND booting. It's necessary that SDRAM is already * configured and available since this code loads the main U-Boot image