This patch adds another build target for the AMCC Sequoia PPC440EPx eval board. This RAM-booting version is targeted for boards without NOR FLASH (NAND booting) which need a possibility to initially program their NAND FLASH. Using a JTAG debugger (e.g. BDI2000/3000) configured to setup the SDRAM, this debugger can load this RAM- booting image to the target address in SDRAM (in this case 0x1000000) and start it there. Then U-Boot's standard NAND commands can be used to program the NAND FLASH (e.g. "nand write ...").
Here the commands to load and start this image from the BDI2000:
440EPX>reset halt 440EPX>load 0x1000000 /tftpboot/sequoia/u-boot.bin 440EPX>go 0x1000000
Please note that this image automatically scans for an already initialized SDRAM TLB (detected by EPN=0). This TLB will not be cleared. This TLB doesn't need to be TLB #0, this RAM-booting version will detect it and preserve it. So booting via BDI2000 will work and booting with a complete different TLB init via U-Boot works as well.
Signed-off-by: Stefan Roese sr@denx.de --- Changes in v3: - Commit text extended (SDRAM TLB scanning/detection)
Changes in v2: - Using #ifdef's instead of __attribute__((unused)) for variable declatration.
Makefile | 11 +++ board/amcc/sequoia/init.S | 7 ++ board/amcc/sequoia/sdram.c | 3 +- board/amcc/sequoia/sequoia.c | 10 +++- board/amcc/sequoia/u-boot-ram.lds | 126 +++++++++++++++++++++++++++++++++++++ cpu/ppc4xx/start.S | 33 ++++++++-- include/configs/amcc-common.h | 11 +++ include/configs/sequoia.h | 30 +++++++-- 8 files changed, 215 insertions(+), 16 deletions(-) create mode 100644 board/amcc/sequoia/u-boot-ram.lds
diff --git a/Makefile b/Makefile index 137c88f..1ae93ab 100644 --- a/Makefile +++ b/Makefile @@ -1533,6 +1533,17 @@ rainier_nand_config: unconfig @echo "TEXT_BASE = 0x01000000" > $(obj)board/amcc/sequoia/config.tmp @echo "CONFIG_NAND_U_BOOT = y" >> $(obj)include/config.mk
+sequoia_ramboot_config \ +rainier_ramboot_config: unconfig + @mkdir -p $(obj)include $(obj)board/amcc/sequoia + @echo "#define CONFIG_SYS_RAMBOOT" > $(obj)include/config.h + @echo "#define CONFIG_$$(echo $(subst ,,$(@:_config=)) | \ + tr '[:lower:]' '[:upper:]')" >> $(obj)include/config.h + @$(MKCONFIG) -n $@ -a sequoia ppc ppc4xx sequoia amcc + @echo "TEXT_BASE = 0x01000000" > $(obj)board/amcc/sequoia/config.tmp + @echo "LDSCRIPT = board/amcc/sequoia/u-boot-ram.lds" >> \ + $(obj)board/amcc/sequoia/config.tmp + taihu_config: unconfig @$(MKCONFIG) $(@:_config=) ppc ppc4xx taihu amcc
diff --git a/board/amcc/sequoia/init.S b/board/amcc/sequoia/init.S index 4452d26..3c0e400 100644 --- a/board/amcc/sequoia/init.S +++ b/board/amcc/sequoia/init.S @@ -43,12 +43,19 @@ tlbtab: /* vxWorks needs this as first entry for the Machine Check interrupt */ tlbentry( 0x40000000, SZ_256M, 0, 0, AC_R|AC_W|AC_X|SA_G|SA_I )
+ /* + * The RAM-boot version skips the SDRAM TLB (identified by EPN=0). This + * entry is already configured for SDRAM via the JTAG debugger and mustn't + * be re-initialized by this RAM-booting U-Boot version. + */ +#ifndef CONFIG_SYS_RAMBOOT /* TLB-entry for DDR SDRAM (Up to 2GB) */ #ifdef CONFIG_4xx_DCACHE tlbentry( CONFIG_SYS_SDRAM_BASE, SZ_256M, CONFIG_SYS_SDRAM_BASE, 0, AC_R|AC_W|AC_X|SA_G) #else tlbentry( CONFIG_SYS_SDRAM_BASE, SZ_256M, CONFIG_SYS_SDRAM_BASE, 0, AC_R|AC_W|AC_X|SA_G|SA_I ) #endif +#endif /* CONFIG_SYS_RAMBOOT */
/* TLB-entry for EBC */ tlbentry( CONFIG_SYS_BCSR_BASE, SZ_256M, CONFIG_SYS_BCSR_BASE, 1, AC_R|AC_W|AC_X|SA_G|SA_I ) diff --git a/board/amcc/sequoia/sdram.c b/board/amcc/sequoia/sdram.c index 6df4c6d..bde471c 100644 --- a/board/amcc/sequoia/sdram.c +++ b/board/amcc/sequoia/sdram.c @@ -54,7 +54,8 @@ extern void denali_core_search_data_eye(void); ************************************************************************/ phys_size_t initdram (int board_type) { -#if !defined(CONFIG_NAND_U_BOOT) || defined(CONFIG_NAND_SPL) +#if !(defined(CONFIG_NAND_U_BOOT) || defined(CONFIG_SYS_RAMBOOT)) || \ + defined(CONFIG_NAND_SPL) ulong speed = get_bus_freq(0);
mtsdram(DDR0_02, 0x00000000); diff --git a/board/amcc/sequoia/sequoia.c b/board/amcc/sequoia/sequoia.c index e824b8f..246ad94 100644 --- a/board/amcc/sequoia/sequoia.c +++ b/board/amcc/sequoia/sequoia.c @@ -33,7 +33,9 @@
DECLARE_GLOBAL_DATA_PTR;
+#if !defined(CONFIG_SYS_NO_FLASH) extern flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS]; /* info for FLASH chips */ +#endif
extern void __ft_board_setup(void *blob, bd_t *bd); ulong flash_get_size(ulong base, int banknum); @@ -122,16 +124,19 @@ int board_early_init_f(void)
int misc_init_r(void) { +#if !defined(CONFIG_SYS_NO_FLASH) uint pbcr; int size_val = 0; - u32 reg; +#endif #ifdef CONFIG_440EPX unsigned long usb2d0cr = 0; unsigned long usb2phy0cr, usb2h0cr = 0; unsigned long sdr0_pfc1; char *act = getenv("usbact"); #endif + u32 reg;
+#if !defined(CONFIG_SYS_NO_FLASH) /* Re-do flash sizing to get full correct info */
/* adjust flash start and offset */ @@ -171,6 +176,7 @@ int misc_init_r(void) CONFIG_ENV_ADDR_REDUND + 2*CONFIG_ENV_SECT_SIZE - 1, &flash_info[0]); #endif +#endif /* CONFIG_SYS_NO_FLASH */
/* * USB suff... @@ -515,7 +521,7 @@ int post_hotkeys_pressed(void) } #endif /* CONFIG_POST */
-#if defined(CONFIG_NAND_U_BOOT) +#if defined(CONFIG_NAND_U_BOOT) || defined(CONFIG_SYS_RAMBOOT) /* * On NAND-booting sequoia, we need to patch the chips select numbers * in the dtb (CS0 - NAND, CS3 - NOR) diff --git a/board/amcc/sequoia/u-boot-ram.lds b/board/amcc/sequoia/u-boot-ram.lds new file mode 100644 index 0000000..9393b65 --- /dev/null +++ b/board/amcc/sequoia/u-boot-ram.lds @@ -0,0 +1,126 @@ +/* + * (C) Copyright 2009 + * Stefan Roese, DENX Software Engineering, sr@denx.de. + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +OUTPUT_ARCH(powerpc) +SECTIONS +{ + /* Read-only sections, merged into text segment: */ + . = + SIZEOF_HEADERS; + .interp : { *(.interp) } + .hash : { *(.hash) } + .dynsym : { *(.dynsym) } + .dynstr : { *(.dynstr) } + .rel.text : { *(.rel.text) } + .rela.text : { *(.rela.text) } + .rel.data : { *(.rel.data) } + .rela.data : { *(.rela.data) } + .rel.rodata : { *(.rel.rodata) } + .rela.rodata : { *(.rela.rodata) } + .rel.got : { *(.rel.got) } + .rela.got : { *(.rela.got) } + .rel.ctors : { *(.rel.ctors) } + .rela.ctors : { *(.rela.ctors) } + .rel.dtors : { *(.rel.dtors) } + .rela.dtors : { *(.rela.dtors) } + .rel.bss : { *(.rel.bss) } + .rela.bss : { *(.rela.bss) } + .rel.plt : { *(.rel.plt) } + .rela.plt : { *(.rela.plt) } + .init : { *(.init) } + .plt : { *(.plt) } + .text : + { + cpu/ppc4xx/start.o (.text) + + *(.text) + *(.fixup) + *(.got1) + } + _etext = .; + PROVIDE (etext = .); + .rodata : + { + *(SORT_BY_ALIGNMENT(SORT_BY_NAME(.rodata*))) + } + .fini : { *(.fini) } =0 + .ctors : { *(.ctors) } + .dtors : { *(.dtors) } + + /* Read-write section, merged into data segment: */ + . = (. + 0x00FF) & 0xFFFFFF00; + _erotext = .; + PROVIDE (erotext = .); + .reloc : + { + *(.got) + _GOT2_TABLE_ = .; + *(.got2) + _FIXUP_TABLE_ = .; + *(.fixup) + } + __got2_entries = (_FIXUP_TABLE_ - _GOT2_TABLE_) >>2; + __fixup_entries = (. - _FIXUP_TABLE_)>>2; + + .data : + { + *(.data) + *(.data1) + *(.sdata) + *(.sdata2) + *(.dynamic) + CONSTRUCTORS + } + _edata = .; + PROVIDE (edata = .); + + . = .; + __u_boot_cmd_start = .; + .u_boot_cmd : { *(.u_boot_cmd) } + __u_boot_cmd_end = .; + + + . = .; + __start___ex_table = .; + __ex_table : { *(__ex_table) } + __stop___ex_table = .; + + . = ALIGN(256); + __init_begin = .; + .text.init : { *(.text.init) } + .data.init : { *(.data.init) } + . = ALIGN(256); + __init_end = .; + + __bss_start = .; + .bss (NOLOAD) : + { + *(.sbss) *(.scommon) + *(.dynbss) + *(.bss) + *(COMMON) + . = ALIGN(4); + } + + _end = . ; + PROVIDE (end = .); +} diff --git a/cpu/ppc4xx/start.S b/cpu/ppc4xx/start.S index f2b8908..ac96fc2 100644 --- a/cpu/ppc4xx/start.S +++ b/cpu/ppc4xx/start.S @@ -257,6 +257,14 @@ bl board_init_f #endif
+#if defined(CONFIG_SYS_RAMBOOT) + /* + * 4xx RAM-booting U-Boot image is started from offset 0 + */ + .text + bl _start_440 +#endif + /* * 440 Startup -- on reset only the top 4k of the effective * address space is mapped in by an entry in the instruction @@ -444,10 +452,17 @@ skip_debug_init: addis r0,0,0x0000 li r1,0x003f /* 64 TLB entries */ mtctr r1 -rsttlb: tlbwe r0,r1,0x0000 /* Invalidate all entries (V=0)*/ - tlbwe r0,r1,0x0001 - tlbwe r0,r1,0x0002 - subi r1,r1,0x0001 + li r4,0 /* Start with TLB #0 */ +rsttlb: +#ifdef CONFIG_SYS_RAMBOOT + tlbre r3,r4,0 /* Read contents from TLB word #0 to get EPN */ + rlwinm. r3,r3,0,0xfffffc00 /* Mask EPN */ + beq tlbnxt /* Skip EPN=0 TLB, this is the SDRAM TLB */ +#endif + tlbwe r0,r4,0 /* Invalidate all entries (V=0)*/ + tlbwe r0,r4,1 + tlbwe r0,r4,2 +tlbnxt: addi r4,r4,1 /* Next TLB */ bdnz rsttlb
/*----------------------------------------------------------------*/ @@ -476,7 +491,13 @@ rsttlb: tlbwe r0,r1,0x0000 /* Invalidate all entries (V=0)*/ li r4,0 /* TLB # */
addi r5,r5,-4 -1: lwzu r0,4(r5) +1: +#ifdef CONFIG_SYS_RAMBOOT + tlbre r3,r4,0 /* Read contents from TLB word #0 */ + rlwinm. r3,r3,0,0x00000200 /* Mask V (valid) bit */ + bne tlbnx2 /* Skip V=1 TLB, this is the SDRAM TLB */ +#endif + lwzu r0,4(r5) cmpwi r0,0 beq 2f /* 0 marks end */ lwzu r1,4(r5) @@ -484,7 +505,7 @@ rsttlb: tlbwe r0,r1,0x0000 /* Invalidate all entries (V=0)*/ tlbwe r0,r4,0 /* TLB Word 0 */ tlbwe r1,r4,1 /* TLB Word 1 */ tlbwe r2,r4,2 /* TLB Word 2 */ - addi r4,r4,1 /* Next TLB */ +tlbnx2: addi r4,r4,1 /* Next TLB */ bdnz 1b
/*----------------------------------------------------------------*/ diff --git a/include/configs/amcc-common.h b/include/configs/amcc-common.h index d3dc3e5..3b733c0 100644 --- a/include/configs/amcc-common.h +++ b/include/configs/amcc-common.h @@ -76,6 +76,17 @@ #define CONFIG_CMD_PING #define CONFIG_CMD_REGINFO
+#if defined(CONFIG_SYS_RAMBOOT) +/* + * Disable NOR FLASH commands on RAM-booting version. One main reason for this + * RAM-booting version is boards with NAND and without NOR. This image can + * be used for initial NAND programming. + */ +#define CONFIG_SYS_NO_FLASH +#undef CONFIG_CMD_FLASH +#undef CONFIG_CMD_IMLS +#endif + /* * Miscellaneous configurable options */ diff --git a/include/configs/sequoia.h b/include/configs/sequoia.h index fa226b2..89acacc 100644 --- a/include/configs/sequoia.h +++ b/include/configs/sequoia.h @@ -112,13 +112,26 @@ /* * Environment */ -#if !defined(CONFIG_NAND_U_BOOT) && !defined(CONFIG_NAND_SPL) -#define CONFIG_ENV_IS_IN_FLASH 1 /* use FLASH for environ vars */ +#if defined(CONFIG_NAND_U_BOOT) || defined(CONFIG_NAND_SPL) +#define CONFIG_ENV_IS_IN_NAND /* use NAND for environ vars */ +#define CONFIG_ENV_IS_EMBEDDED /* use embedded environment */ +#elif defined(CONFIG_SYS_RAMBOOT) +#define CONFIG_ENV_IS_NOWHERE /* Store env in memory only */ +#define CONFIG_ENV_SIZE (8 << 10) +/* + * In RAM-booting version, we have no environment storage. So we need to + * provide at least preliminary MAC addresses for the 4xx EMAC driver to + * register the interfaces. Those two addresses are generated via the + * tools/gen_eth_addr tool and should only be used in a closed laboratory + * environment. + */ +#define CONFIG_ETHADDR 4a:56:49:22:3e:43 +#define CONFIG_ETH1ADDR 02:93:53:d5:06:98 #else -#define CONFIG_ENV_IS_IN_NAND 1 /* use NAND for environ vars */ -#define CONFIG_ENV_IS_EMBEDDED 1 /* use embedded environment */ +#define CONFIG_ENV_IS_IN_FLASH /* use FLASH for environ vars */ #endif
+#if defined(CONFIG_CMD_FLASH) /* * FLASH related */ @@ -148,6 +161,7 @@ #define CONFIG_ENV_ADDR_REDUND (CONFIG_ENV_ADDR-CONFIG_ENV_SECT_SIZE) #define CONFIG_ENV_SIZE_REDUND (CONFIG_ENV_SIZE) #endif +#endif /* CONFIG_CMD_FLASH */
/* * IPL (Initial Program Loader, integrated inside CPU) @@ -211,7 +225,8 @@ * DDR SDRAM */ #define CONFIG_SYS_MBYTES_SDRAM (256) /* 256MB */ -#if !defined(CONFIG_NAND_U_BOOT) && !defined(CONFIG_NAND_SPL) +#if !defined(CONFIG_NAND_U_BOOT) && !defined(CONFIG_NAND_SPL) && \ + !defined(CONFIG_SYS_RAMBOOT) #define CONFIG_DDR_DATA_EYE /* use DDR2 optimization */ #endif #define CONFIG_SYS_MEM_TOP_HIDE (4 << 10) /* don't use last 4kbytes */ @@ -306,7 +321,7 @@ * overwrite part of the U-Boot image which is already loaded from NAND * to SDRAM. */ -#if defined(CONFIG_NAND_U_BOOT) +#if defined(CONFIG_NAND_U_BOOT) || defined(CONFIG_SYS_RAMBOOT) #define CONFIG_SYS_POST_MEMORY_ON 0 #else #define CONFIG_SYS_POST_MEMORY_ON CONFIG_SYS_POST_MEMORY @@ -354,7 +369,8 @@ /* * On Sequoia CS0 and CS3 are switched when configuring for NAND booting */ -#if !defined(CONFIG_NAND_U_BOOT) && !defined(CONFIG_NAND_SPL) +#if !defined(CONFIG_NAND_U_BOOT) && !defined(CONFIG_NAND_SPL) && \ + !defined(CONFIG_SYS_RAMBOOT) #define CONFIG_SYS_NAND_CS 3 /* NAND chip connected to CSx */ /* Memory Bank 0 (NOR-FLASH) initialization */ #define CONFIG_SYS_EBC_PB0AP 0x03017200