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feat(st): add logic to boot the platform from an alternate bank

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In a few scenarios, there is a need to boot the platform from an
alernate bank which is not the active bank. Call the API
fwu_get_alernate_boot_bank() to select an alternate bank to boot the
platform from. Calling this API function might be required in a couple
of cases. One, in the unlikely scenario of the active bank being in an
invalid state, or if the number of times the platform boots in trial
state exceeds a pre-set count.

Also add a debug print that indicates the bank that
the platform is booting from.

Change-Id: I688406540e64d1719af8d5c121821f5bb6335c06
Signed-off-by: Sughosh Ganu <sughosh.ganu@linaro.org>
This commit is contained in:
Sughosh Ganu 2024-02-20 14:20:41 +05:30
parent 6e99fee43e
commit 6166051426
1 changed files with 12 additions and 7 deletions
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19
plat/st/common/bl2_io_storage.c
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@ -613,8 +613,6 @@ int plat_get_image_source(unsigned int image_id, uintptr_t *dev_handle,
* - we already boot FWU_MAX_TRIAL_REBOOT times in trial mode.
* we select the previous_active_index.
*/
#define INVALID_BOOT_IDX 0xFFFFFFFFU
uint32_t plat_fwu_get_boot_idx(void)
{
/*
@ -622,20 +620,26 @@ uint32_t plat_fwu_get_boot_idx(void)
* even if this function is called several times.
*/
static uint32_t boot_idx = INVALID_BOOT_IDX;
const struct fwu_metadata *data;
data = fwu_get_metadata();
if (boot_idx == INVALID_BOOT_IDX) {
const struct fwu_metadata *data = fwu_get_metadata();
boot_idx = data->active_index;
if (data->bank_state[boot_idx] == FWU_BANK_STATE_VALID) {
if (stm32_get_and_dec_fwu_trial_boot_cnt() == 0U) {
WARN("Trial FWU fails %u times\n",
FWU_MAX_TRIAL_REBOOT);
boot_idx = data->previous_active_index;
boot_idx = fwu_get_alternate_boot_bank();
}
} else {
} else if (data->bank_state[boot_idx] ==
FWU_BANK_STATE_ACCEPTED) {
stm32_set_max_fwu_trial_boot_cnt();
} else {
ERROR("The active bank(%u) of the platform is in Invalid State.\n",
boot_idx);
boot_idx = fwu_get_alternate_boot_bank();
stm32_clear_fwu_trial_boot_cnt();
}
}
@ -667,6 +671,7 @@ void plat_fwu_set_images_source(const struct fwu_metadata *metadata)
boot_idx = plat_fwu_get_boot_idx();
assert(boot_idx < NR_OF_FW_BANKS);
VERBOSE("Selecting to boot from bank %u\n", boot_idx);
for (i = 0U; i < NR_OF_IMAGES_IN_FW_BANK; i++) {
img_type_uuid = &metadata->img_entry[i].img_type_uuid;