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bootstd: cros: Allow detection of any kernel partition

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The existing ChromiumOS bootmeth only supports reading a single kernel
partition, either 2 or 4. In fact there are normally two options
available.

Use the GUID to detect kernel partitions, with the BOOTMETHF_ANY_PART
flag, so that bootstd does not require a valid filesystem before calling
the bootmeth.

Tidy up and improve the logging while we are here.

Signed-off-by: Simon Glass <sjg@chromium.org>
Suggested-by: Alper Nebi Yasak <alpernebiyasak@gmail.com>
[trini: Add missing select of PARTITION_TYPE_GUID]
Signed-off-by: Tom Rini <trini@konsulko.com>
This commit is contained in:
Simon Glass 2023-08-24 13:55:45 -06:00 committed by Tom Rini
parent 966b16c59a
commit 71f634b822
3 changed files with 36 additions and 20 deletions
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3
boot/Kconfig
View file

@ -466,6 +466,9 @@ config BOOTMETH_CROS
bool "Bootdev support for Chromium OS"
depends on X86 || ARM || SANDBOX
default y if !ARM
select EFI_PARTITION
select PARTITION_TYPE_GUID
select PARTITION_UUIDS
help
Enables support for booting Chromium OS using bootdevs. This uses the
kernel A slot and obtains the kernel command line from the parameters

48
boot/bootmeth_cros.c
View file

@ -16,16 +16,19 @@
#include <bootmeth.h>
#include <display_options.h>
#include <dm.h>
#include <efi.h>
#include <malloc.h>
#include <mapmem.h>
#include <part.h>
#include <linux/sizes.h>
#include "bootmeth_cros.h"
static const efi_guid_t cros_kern_type = PARTITION_CROS_KERNEL;
/*
* Layout of the ChromeOS kernel
*
* Partitions 2 and 4 contain kernels
* Partitions 2 and 4 contain kernels with type GUID_CROS_KERNEL
*
* Contents are:
*
@ -145,13 +148,25 @@ static int scan_part(struct udevice *blk, int partnum,
{
struct blk_desc *desc = dev_get_uclass_plat(blk);
struct vb2_keyblock *hdr;
struct uuid type;
ulong num_blks;
int ret;
if (!partnum)
return log_msg_ret("efi", -ENOENT);
ret = part_get_info(desc, partnum, info);
if (ret)
return log_msg_ret("part", ret);
/* Check for kernel partition type */
log_debug("part %x: type=%s\n", partnum, info->type_guid);
if (uuid_str_to_bin(info->type_guid, (u8 *)&type, UUID_STR_FORMAT_GUID))
return log_msg_ret("typ", -EINVAL);
if (memcmp(&cros_kern_type, &type, sizeof(type)))
return log_msg_ret("typ", -ENOEXEC);
/* Make a buffer for the header information */
num_blks = PROBE_SIZE >> desc->log2blksz;
log_debug("Reading header, blk=%s, start=%lx, blocks=%lx\n",
@ -167,6 +182,7 @@ static int scan_part(struct udevice *blk, int partnum,
if (memcmp(VB2_KEYBLOCK_MAGIC, hdr->magic, VB2_KEYBLOCK_MAGIC_SIZE)) {
free(hdr);
log_debug("no magic\n");
return -ENOENT;
}
@ -340,24 +356,16 @@ static int cros_read_bootflow(struct udevice *dev, struct bootflow *bflow)
struct vb2_keyblock *hdr;
const char *uuid = NULL;
struct cros_priv *priv;
int part, ret;
int ret;
log_debug("starting, part=%d\n", bflow->part);
log_debug("starting, part=%x\n", bflow->part);
/* We consider the whole disk, not any one partition */
if (bflow->part)
return log_msg_ret("max", -ENOENT);
/* Check partition 2 then 4 */
part = 2;
ret = scan_part(bflow->blk, part, &info, &hdr);
/* Check for kernel partitions */
ret = scan_part(bflow->blk, bflow->part, &info, &hdr);
if (ret) {
part = 4;
ret = scan_part(bflow->blk, part, &info, &hdr);
if (ret)
return log_msg_ret("scan", ret);
log_debug("- scan failed: err=%d\n", ret);
return log_msg_ret("scan", ret);
}
bflow->part = part;
priv = malloc(sizeof(struct cros_priv));
if (!priv) {
@ -366,8 +374,8 @@ static int cros_read_bootflow(struct udevice *dev, struct bootflow *bflow)
}
bflow->bootmeth_priv = priv;
log_info("Selected partition %d, header at %lx\n", bflow->part,
(ulong)map_to_sysmem(hdr));
log_debug("Selected partition %d, header at %lx\n", bflow->part,
(ulong)map_to_sysmem(hdr));
/* Grab a few things from the preamble */
preamble = (void *)hdr + hdr->keyblock_size;
@ -381,8 +389,11 @@ static int cros_read_bootflow(struct udevice *dev, struct bootflow *bflow)
ret = cros_read_info(bflow, uuid, preamble);
preamble = NULL;
free(hdr);
if (ret)
if (ret) {
free(priv->info_buf);
free(priv);
return log_msg_ret("inf", ret);
}
bflow->size = priv->body_size;
bflow->state = BOOTFLOWST_READY;
@ -437,6 +448,7 @@ static int cros_bootmeth_bind(struct udevice *dev)
struct bootmeth_uc_plat *plat = dev_get_uclass_plat(dev);
plat->desc = "ChromiumOS boot";
plat->flags = BOOTMETHF_ANY_PART;
return 0;
}

5
test/boot/bootflow.c
View file

@ -983,9 +983,10 @@ static int bootflow_cros(struct unit_test_state *uts)
ut_assert_nextlinen("Seq");
ut_assert_nextlinen("---");
ut_assert_nextlinen(" 0 extlinux");
ut_assert_nextlinen(" 1 cros ready mmc 2 mmc5.bootdev.whole ");
ut_assert_nextlinen(" 1 cros ready mmc 2 mmc5.bootdev.part_2 ");
ut_assert_nextlinen(" 2 cros ready mmc 4 mmc5.bootdev.part_4 ");
ut_assert_nextlinen("---");
ut_assert_skip_to_line("(2 bootflows, 2 valid)");
ut_assert_skip_to_line("(3 bootflows, 3 valid)");
ut_assert_console_end();