mb/ti/beaglebone: Load romstage/ramstage from SD

Adds a "sd_media" boot_device to allow booting from the SD card. This
assumes that the generated "MLO" file is placed at a 128KB offset from
the start of the SD card, to allow for the MBR etc. to be at the start
of the SD card. Placing the MLO file here allows the AM335x boot ROM to
load and execute the bootblock stage as well, as 128KB is one of the
offsets the boot ROM checks when looking for the next stage to execute.

As part of this, a FMD for the Beaglebone has also been defined. It's
sized at 32M somewhat arbitrarily, as SD cards could allow for much
bigger payloads.

TEST: Beaglebone boots from bootblock into romstage. Romstage to
ramstage still doesn't work as it needs RAM initialization first.

Change-Id: I5f6901217fb974808e84aeb679af2f47eeae30fd
Signed-off-by: Sam Lewis <sam.vr.lewis@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/44385
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Sam Lewis 2020-08-19 21:14:40 +10:00 committed by Arthur Heymans
parent db3fbf22c2
commit c25d54b97e
10 changed files with 172 additions and 47 deletions

View File

@ -5,8 +5,10 @@ if BOARD_TI_BEAGLEBONE
config BOARD_SPECIFIC_OPTIONS
def_bool y
select SOC_TI_AM335X
select BOARD_ROMSIZE_KB_4096
select BOARD_ROMSIZE_KB_32768
select MISSING_BOARD_RESET
select COMMONLIB_STORAGE
select COMMONLIB_STORAGE_SD
config MAINBOARD_DIR
string
@ -28,4 +30,8 @@ config UART_FOR_CONSOLE
int
default 0
config FMDFILE
string
default "src/mainboard/$(CONFIG_MAINBOARD_DIR)/board.fmd"
endif # BOARD_TI_BEAGLEBONE

View File

@ -2,6 +2,9 @@
bootblock-y += bootblock.c
bootblock-y += leds.c
romstage-y += romstage.c
bootblock-y += sd_media.c
#ramstage-y += ramstage.c
romstage-y += romstage.c
romstage-y += sd_media.c
ramstage-y += sd_media.c

View File

@ -0,0 +1,10 @@
SDCARD@0x000 32M {
BIOS@0x0 109K {
BOOTBLOCK@0x0 20K
}
PAYLOAD {
FMAP 2K
COREBOOT(CBFS) 31M
}
}

View File

@ -0,0 +1,124 @@
/* SPDX-License-Identifier: GPL-2.0-only */
#include <boot_device.h>
#include <symbols.h>
#include <console/console.h>
#include <assert.h>
#include <commonlib/storage/sd_mmc.h>
#include <cbmem.h>
#include <soc/ti/am335x/mmc.h>
#include <soc/ti/am335x/header.h>
// Where the coreboot image is expected to be located on the SD card
// Only certain locations are allowed - check the AM335x technical reference
// manual for more details.
#define COREBOOT_IMAGE_OFFSET (128 * KiB)
#define SD_BLOCK_SIZE 512
static struct am335x_mmc_host sd_host;
static struct storage_media media;
static size_t partial_block_read(uint8_t *dest, uint64_t block, uint32_t offset, uint32_t count)
{
static uint8_t overflow_block[SD_BLOCK_SIZE];
uint64_t blocks_read = storage_block_read(&media, block, 1, &overflow_block);
if (blocks_read != 1) {
printk(BIOS_ERR, "Expected to read 1 block but read: %llu\n", blocks_read);
return 0;
}
assert((offset + count) <= SD_BLOCK_SIZE);
int dest_index = 0;
for (int overflow_index = offset; overflow_index < (offset + count); overflow_index++)
dest[dest_index++] = overflow_block[overflow_index];
return count;
}
// This supports reads from a SD card that aren't necessarily aligned to the
// sd block size
static ssize_t sd_readat(const struct region_device *rdev, void *dest, size_t offset,
size_t count)
{
uint8_t *buffer = (uint8_t *)dest;
uint64_t block_start = offset / SD_BLOCK_SIZE;
uint64_t block_end = (offset + count) / SD_BLOCK_SIZE;
uint64_t blocks = block_end - block_start + 1;
// Read the last first, which might not be aligned on a SD block
uint32_t first_block_offset = offset % SD_BLOCK_SIZE;
size_t first_block_to_read = MIN(SD_BLOCK_SIZE - first_block_offset, count);
size_t bytes_read = partial_block_read(buffer, block_start, first_block_offset,
first_block_to_read);
if (blocks == 1)
return bytes_read;
buffer += bytes_read;
if (blocks > 2) {
// Read all the "whole" blocks between the start and end blocks
uint64_t to_read = blocks - 2;
uint64_t blocks_read =
storage_block_read(&media, block_start + 1, to_read, (void *)buffer);
if (blocks_read != to_read) {
printk(BIOS_ERR, "Expecting to read %llu blocks but only read %llu\n",
to_read, blocks_read);
return blocks_read * SD_BLOCK_SIZE;
}
buffer += to_read * SD_BLOCK_SIZE;
bytes_read += to_read * SD_BLOCK_SIZE;
}
// Read the last block, which might not be aligned on a SD block
bytes_read += partial_block_read(buffer, block_end, 0, count - bytes_read);
return bytes_read;
}
static const struct region_device_ops am335x_sd_ops = {
.mmap = mmap_helper_rdev_mmap,
.munmap = mmap_helper_rdev_munmap,
.readat = sd_readat,
};
extern struct omap_image_headers headers;
static struct mmap_helper_region_device sd_mdev = MMAP_HELPER_REGION_INIT(
&am335x_sd_ops, COREBOOT_IMAGE_OFFSET + sizeof(headers), CONFIG_ROM_SIZE);
static bool init_done = false;
void boot_device_init(void)
{
if (init_done)
return;
sd_host.sd_clock_hz = 96000000;
sd_host.reg = (void *)MMCHS0_BASE;
am335x_mmc_init_storage(&sd_host);
storage_setup_media(&media, &sd_host.sd_mmc_ctrlr);
storage_display_setup(&media);
if (ENV_BOOTBLOCK) {
mmap_helper_device_init(&sd_mdev, _cbfs_cache, REGION_SIZE(cbfs_cache));
} else {
mmap_helper_device_init(&sd_mdev, _postram_cbfs_cache,
REGION_SIZE(postram_cbfs_cache));
}
init_done = true;
}
const struct region_device *boot_device_ro(void)
{
return &sd_mdev.rdev;
}

View File

@ -1,17 +1,17 @@
ifeq ($(CONFIG_SOC_TI_AM335X),y)
bootblock-y += bootblock.c
bootblock-y += bootblock_media.c
bootblock-y += timer.c
bootblock-y += gpio.c
bootblock-y += pinmux.c
bootblock-y += mmc.c
romstage-y += nand.c
romstage-y += cbmem.c
romstage-y += timer.c
romstage-y += mmc.c
ramstage-y += timer.c
ramstage-y += nand.c
ramstage-y += soc.c
ramstage-y += soc.c
ramstage-y += mmc.c
bootblock-y += uart.c
romstage-y += uart.c

View File

@ -1,12 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0-only */
#include <boot_device.h>
#include <symbols.h>
static const struct mem_region_device boot_dev =
MEM_REGION_DEV_RO_INIT(_sram, CONFIG_ROM_SIZE);
const struct region_device *boot_device_ro(void)
{
return &boot_dev.rdev;
}

View File

@ -6,23 +6,6 @@
#include "header.h"
struct config_headers {
// The table of contents.
struct configuration_header_toc_item toc_chsettings;
struct configuration_header_toc_item toc_end;
// An inert instance of chsettings.
struct configuration_header_settings chsettings;
} __packed;
struct omap_image_headers {
union {
struct config_headers config_headers;
uint8_t bytes[512];
};
struct gp_device_header image_header;
};
// A symbol which defines how much of the image the iROM should load.
extern char header_load_size;

View File

@ -47,4 +47,21 @@ struct gp_device_header {
uint32_t destination;
} __packed;
struct config_headers {
// The table of contents.
struct configuration_header_toc_item toc_chsettings;
struct configuration_header_toc_item toc_end;
// An inert instance of chsettings.
struct configuration_header_settings chsettings;
} __packed;
struct omap_image_headers {
union {
struct config_headers config_headers;
uint8_t bytes[512];
};
struct gp_device_header image_header;
};
#endif

View File

@ -13,11 +13,14 @@ SECTIONS
TTB(0x402F8000, 16K)
ROMSTAGE(0x402F8000+16K, 40K)
PRERAM_CBFS_CACHE(0x402F8000+16K+40K, 20K)
STACK(0x4030be00, 4K)
SRAM_END(0x40310000)
DRAM_START(0x80000000)
RAMSTAGE(0x80200000, 192K)
DRAM_START(0x80000000)
RAMSTAGE(0x80000000, 2M)
POSTRAM_CBFS_CACHE(0x80200000, 32M)
#ifdef OMAP_HEADER
.header : {

View File

@ -1,9 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0-only */
#include <boot_device.h>
const struct region_device *boot_device_ro(void)
{
/* FIXME: add support for reading coreboot from NAND */
return NULL;
}