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boot: android: import addBootConfigParameters() from AOSP

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To properly implement Android boot image v4, U-Boot must be able to
add additional entries to the bootconfig.

Add `add_bootconfig_parameters()` to do so.

This has been imported from Google's U-Boot source[1]
The variables/function names have been reworked to be
compliant with U-Boot's coding style.

[1] 7af0a0506d

Signed-off-by: Mattijs Korpershoek (TI.com) <mkorpershoek@kernel.org>
Reviewed-by: Mattijs Korpershoek <mkorpershoek@kernel.org>
Signed-off-by: Guillaume La Roque (TI.com) <glaroque@baylibre.com>
Link: https://lore.kernel.org/r/20260112-bootconfig-v5-1-79b242159ac7@baylibre.com
Signed-off-by: Mattijs Korpershoek <mkorpershoek@kernel.org>
This commit is contained in:
Mattijs Korpershoek (TI.com)
2026-01-12 11:55:37 +01:00
committed by Mattijs Korpershoek
parent 8fa0cf5f3d
commit 6b0f079ba2
1 changed files with 40 additions and 0 deletions
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40
boot/image-android.c
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@@ -57,6 +57,46 @@ static ulong add_trailer(ulong bootconfig_start_addr, ulong bootconfig_size)
return BOOTCONFIG_TRAILER_SIZE;
}
/*
* Add a string of boot config parameters to memory appended by the trailer.
* NOTE: This function expects bootconfig_start_addr to be already mapped.
* It works directly with the mapped pointer, not a physical address.
*/
static long add_bootconfig_parameters(char *params, long params_len,
ulong bootconfig_start_addr, u32 bootconfig_size)
{
long applied_bytes = 0;
long new_size = 0;
ulong end;
if (!params || !bootconfig_start_addr)
return -EINVAL;
if (params_len == 0)
return 0;
end = bootconfig_start_addr + bootconfig_size;
if (is_trailer_present(end)) {
end -= BOOTCONFIG_TRAILER_SIZE;
applied_bytes -= BOOTCONFIG_TRAILER_SIZE;
memcpy(&new_size, (void *)end, BOOTCONFIG_SIZE_SIZE);
} else {
/*
* When no trailer is present, the bootconfig_size includes the actual content.
* We should write new parameters right after the existing content.
*/
end = bootconfig_start_addr + bootconfig_size;
new_size = bootconfig_size;
}
memcpy((void *)end, params, params_len);
applied_bytes += params_len;
applied_bytes += add_trailer(bootconfig_start_addr,
bootconfig_size + applied_bytes);
return applied_bytes;
}
__weak ulong get_avendor_bootimg_addr(void)
{
return -1;