Enable the SD controller driver for the Raspberry Pi. Enable a number of useful MMC, partition, and filesystem-related commands. Set up the environment to provide standard locations for loading a kernel, DTB, etc. Provide a boot command that loads and executes boot.scr.uimg from the SD card; this is written considering future extensibilty to USB storage.
Signed-off-by: Stephen Warren swarren@wwwdotorg.org --- arch/arm/include/asm/arch-bcm2835/mbox.h | 26 ++++++++++++ board/raspberrypi/rpi_b/rpi_b.c | 26 ++++++++++++ include/configs/rpi_b.h | 68 ++++++++++++++++++++++++++++-- 3 files changed, 117 insertions(+), 3 deletions(-)
diff --git a/arch/arm/include/asm/arch-bcm2835/mbox.h b/arch/arm/include/asm/arch-bcm2835/mbox.h index 6e040c5..5a9bd87 100644 --- a/arch/arm/include/asm/arch-bcm2835/mbox.h +++ b/arch/arm/include/asm/arch-bcm2835/mbox.h @@ -143,6 +143,32 @@ struct bcm2835_mbox_tag_get_arm_mem { } body; };
+#define BCM2835_MBOX_TAG_GET_CLOCK_RATE 0x00030002 + +#define BCM2835_MBOX_CLOCK_ID_EMMC 1 +#define BCM2835_MBOX_CLOCK_ID_UART 2 +#define BCM2835_MBOX_CLOCK_ID_ARM 3 +#define BCM2835_MBOX_CLOCK_ID_CORE 4 +#define BCM2835_MBOX_CLOCK_ID_V3D 5 +#define BCM2835_MBOX_CLOCK_ID_H264 6 +#define BCM2835_MBOX_CLOCK_ID_ISP 7 +#define BCM2835_MBOX_CLOCK_ID_SDRAM 8 +#define BCM2835_MBOX_CLOCK_ID_PIXEL 9 +#define BCM2835_MBOX_CLOCK_ID_PWM 10 + +struct bcm2835_mbox_tag_get_clock_rate { + struct bcm2835_mbox_tag_hdr tag_hdr; + union { + struct { + u32 clock_id; + } req; + struct { + u32 clock_id; + u32 rate_hz; + } resp; + } body; +}; + #define BCM2835_MBOX_TAG_ALLOCATE_BUFFER 0x00040001
struct bcm2835_mbox_tag_allocate_buffer { diff --git a/board/raspberrypi/rpi_b/rpi_b.c b/board/raspberrypi/rpi_b/rpi_b.c index 3c654a1..6b3e095 100644 --- a/board/raspberrypi/rpi_b/rpi_b.c +++ b/board/raspberrypi/rpi_b/rpi_b.c @@ -16,6 +16,7 @@
#include <common.h> #include <asm/arch/mbox.h> +#include <asm/arch/sdhci.h> #include <asm/global_data.h>
DECLARE_GLOBAL_DATA_PTR; @@ -26,6 +27,12 @@ struct msg_get_arm_mem { u32 end_tag; };
+struct msg_get_clock_rate { + struct bcm2835_mbox_hdr hdr; + struct bcm2835_mbox_tag_get_clock_rate get_clock_rate; + u32 end_tag; +}; + int dram_init(void) { ALLOC_ALIGN_BUFFER(struct msg_get_arm_mem, msg, 1, 16); @@ -51,3 +58,22 @@ int board_init(void)
return 0; } + +int board_mmc_init(void) +{ + ALLOC_ALIGN_BUFFER(struct msg_get_clock_rate, msg_clk, 1, 16); + int ret; + + BCM2835_MBOX_INIT_HDR(msg_clk); + BCM2835_MBOX_INIT_TAG(&msg_clk->get_clock_rate, GET_CLOCK_RATE); + msg_clk->get_clock_rate.body.req.clock_id = BCM2835_MBOX_CLOCK_ID_EMMC; + + ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg_clk->hdr); + if (ret) { + printf("bcm2835: Could not query eMMC clock rate\n"); + return -1; + } + + return bcm2835_sdhci_init(BCM2835_SDHCI_BASE, + msg_clk->get_clock_rate.body.resp.rate_hz); +} diff --git a/include/configs/rpi_b.h b/include/configs/rpi_b.h index a709feb..4d834e1 100644 --- a/include/configs/rpi_b.h +++ b/include/configs/rpi_b.h @@ -50,6 +50,7 @@ #define CONFIG_SYS_MALLOC_LEN SZ_4M #define CONFIG_SYS_MEMTEST_START 0x00100000 #define CONFIG_SYS_MEMTEST_END 0x00200000 +#define CONFIG_LOADADDR 0x00200000
/* Flash */ #define CONFIG_SYS_NO_FLASH @@ -69,6 +70,13 @@ #define CONFIG_VIDEO_BCM2835 #define CONFIG_SYS_WHITE_ON_BLACK
+/* SD/MMC configuration */ +#define CONFIG_GENERIC_MMC +#define CONFIG_MMC +#define CONFIG_SDHCI +#define CONFIG_MMC_SDHCI_IO_ACCESSORS +#define CONFIG_BCM2835_SDHCI + /* Console UART */ #define CONFIG_PL011_SERIAL #define CONFIG_PL011_CLOCK 3000000 @@ -84,12 +92,59 @@ /* Environment */ #define CONFIG_ENV_SIZE SZ_16K #define CONFIG_ENV_IS_NOWHERE +#define CONFIG_ENV_VARS_UBOOT_CONFIG #define CONFIG_SYS_LOAD_ADDR 0x1000000 #define CONFIG_CONSOLE_MUX #define CONFIG_SYS_CONSOLE_IS_IN_ENV -#define CONFIG_EXTRA_ENV_SETTINGS "stdin=serial\0" \ - "stderr=serial,lcd\0" \ - "stdout=serial,lcd\0" +/* + * Memory layout for where various images get loaded by boot scripts: + * + * scriptaddr can be pretty much anywhere that doesn't conflict with something + * else. Put it low in memory to avoid conflicts. + * + * kernel_addr_r must be within the first 128M of RAM in order for the + * kernel's CONFIG_AUTO_ZRELADDR option to work. Since the kernel will + * decompress itself to 0x8000 after the start of RAM, kernel_addr_r + * should not overlap that area, or the kernel will have to copy itself + * somewhere else before decompression. Similarly, the address of any other + * data passed to the kernel shouldn't overlap the start of RAM. Pushing + * this up to 16M allows for a sizable kernel to be decompressed below the + * compressed load address. + * + * fdt_addr_r simply shouldn't overlap anything else. Choosing 32M allows for + * the compressed kernel to be up to 16M too. + * + * ramdisk_addr_r simply shouldn't overlap anything else. Choosing 33M allows + * for the FDT/DTB to be up to 1M, which is hopefully plenty. + */ +#define CONFIG_EXTRA_ENV_SETTINGS \ + "stdin=serial\0" \ + "stderr=serial,lcd\0" \ + "stdout=serial,lcd\0" \ + "scriptaddr=0x00000000\0" \ + "kernel_addr_r=0x01000000\0" \ + "fdt_addr_r=0x02000000\0" \ + "ramdisk_addr_r=0x02100000\0" \ + "boot_targets=mmc0\0" \ + \ + "script_boot=" \ + "if fatload ${devtype} ${devnum}:1 " \ + "${scriptaddr} boot.scr.uimg; then " \ + "source ${scriptaddr}; " \ + "fi;\0" \ + \ + "mmc_boot=" \ + "setenv devtype mmc; " \ + "if mmc dev ${devnum}; then " \ + "run script_boot; " \ + "fi\0" \ + \ + "bootcmd_mmc0=setenv devnum 0; run mmc_boot\0" \ + +#define CONFIG_BOOTCOMMAND \ + "for target in ${boot_targets}; do run bootcmd_${target}; done" + +#define CONFIG_BOOTDELAY 2
/* Shell */ #define CONFIG_SYS_HUSH_PARSER @@ -104,6 +159,13 @@ #include <config_cmd_default.h> #define CONFIG_CMD_BOOTZ #define CONFIG_CMD_GPIO +#define CONFIG_CMD_MMC +#define CONFIG_DOS_PARTITION +#define CONFIG_PARTITION_UUIDS +#define CONFIG_CMD_PART +#define CONFIG_CMD_FS_GENERIC +#define CONFIG_CMD_FAT +#define CONFIG_CMD_EXT /* Some things don't make sense on this HW or yet */ #undef CONFIG_CMD_FPGA #undef CONFIG_CMD_NET