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km/ls102xa: use unused scratchrw4 address for post word

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The SCRATCHRW4 is only used in secure boot scenario that is unsupported by
our design, so this address can be stolen for storing POST status.
The SCRATCHRW4 is initialized to zero at core rest.

Using a DDR address was unfortunate choice, the DDR at boot time has a
random contend and it happens that sometimes is matching POST magic number.
This behavior can lead to undefined POST behavior and u-boot ending in
failbootcmd command.

Signed-off-by: Aleksandar Gerasimovski <aleksandar.gerasimovski@hitachienergy.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
This commit is contained in:
Aleksandar Gerasimovski 2021-11-16 13:13:35 +00:00 committed by Priyanka Jain
parent 60eb0f3c51
commit 987b182830
1 changed files with 5 additions and 6 deletions
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11
board/keymile/pg-wcom-ls102xa/pg-wcom-ls102xa.c
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@ -162,19 +162,18 @@ int post_hotkeys_pressed(void)
return qrio_get_selftest_pin();
}
/* POST word is located in the unused SCRATCHRW4 register */
#define CCSR_SCRATCHRW4_ADDR 0x1ee020c
ulong post_word_load(void)
{
/* POST word is located at the beginning of reserved physical RAM */
void *addr = (void *)(CONFIG_SYS_SDRAM_BASE +
gd->ram_size - CONFIG_KM_RESERVED_PRAM + 8);
void *addr = (void *)CCSR_SCRATCHRW4_ADDR;
return in_le32(addr);
}
void post_word_store(ulong value)
{
/* POST word is located at the beginning of reserved physical RAM */
void *addr = (void *)(CONFIG_SYS_SDRAM_BASE +
gd->ram_size - CONFIG_KM_RESERVED_PRAM + 8);
void *addr = (void *)CCSR_SCRATCHRW4_ADDR;
out_le32(addr, value);
}