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bootstd: cros: Support a kernel on either partition

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ChromiumOS allows a kernel to be on either partition 2 or 4. Add support
for scanning both and using the first one we find with a suitable
signature.

Record the partition which is used.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2023-07-30 11:16:50 -06:00
parent de30aa9a2f
commit 4cfe4510f1
1 changed files with 14 additions and 7 deletions
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21
boot/bootmeth_cros.c
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@ -13,6 +13,7 @@
#include <bootdev.h>
#include <bootflow.h>
#include <bootmeth.h>
#include <display_options.h>
#include <dm.h>
#include <malloc.h>
#include <mapmem.h>
@ -133,7 +134,7 @@ static int cros_read_bootflow(struct udevice *dev, struct bootflow *bflow)
struct disk_partition info;
const char *uuid = NULL;
void *buf, *hdr;
int ret;
int part, ret;
log_debug("starting, part=%d\n", bflow->part);
@ -141,13 +142,19 @@ static int cros_read_bootflow(struct udevice *dev, struct bootflow *bflow)
if (bflow->part)
return log_msg_ret("max", -ENOENT);
/* Check partition 2 */
ret = scan_part(bflow->blk, 2, &info, &hdr);
if (ret)
return log_msg_ret("scan", ret);
bflow->part = 2;
/* Check partition 2 then 4 */
part = 2;
ret = scan_part(bflow->blk, part, &info, &hdr);
if (ret) {
part = 4;
ret = scan_part(bflow->blk, part, &info, &hdr);
if (ret)
return log_msg_ret("scan", ret);
}
bflow->part = part;
log_info("Header at %lx\n", (ulong)map_to_sysmem(hdr));
log_info("Selected parition %d, header at %lx\n", bflow->part,
(ulong)map_to_sysmem(hdr));
start = *(u32 *)(hdr + KERN_START);
size = ALIGN(*(u32 *)(hdr + KERN_SIZE), desc->blksz);
log_debug("Reading start %lx size %lx\n", start, size);