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arm: mach-k3: am642: Store boot info from ROM

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For AM642, ROM supports loading system firmware directly
from boot image. ROM passes information about the number of
images that are loaded to bootloader at a specific address
that is temporary.  Add support for storing this information
somewhere permanent before it gets corrupted.

Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
This commit is contained in:
Dave Gerlach 2021-04-23 11:27:35 -05:00 committed by Lokesh Vutla
parent b4a8c3b242
commit 6d52c9dd90
2 changed files with 23 additions and 0 deletions
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21
arch/arm/mach-k3/am642_init.c
View File

@ -29,12 +29,33 @@ static void ctrl_mmr_unlock(void)
mmr_unlock(CTRL_MMR0_BASE, 6);
}
/*
* This uninitialized global variable would normal end up in the .bss section,
* but the .bss is cleared between writing and reading this variable, so move
* it to the .data section.
*/
u32 bootindex __section(".data");
static struct rom_extended_boot_data bootdata __section(.data);
static void store_boot_info_from_rom(void)
{
bootindex = *(u32 *)(CONFIG_SYS_K3_BOOT_PARAM_TABLE_INDEX);
memcpy(&bootdata, (uintptr_t *)ROM_ENTENDED_BOOT_DATA_INFO,
sizeof(struct rom_extended_boot_data));
}
void board_init_f(ulong dummy)
{
#if defined(CONFIG_CPU_V7R)
setup_k3_mpu_regions();
#endif
/*
* Cannot delay this further as there is a chance that
* K3_BOOT_PARAM_TABLE_INDEX can be over written by SPL MALLOC section.
*/
store_boot_info_from_rom();
ctrl_mmr_unlock();
/* Init DM early */

2
arch/arm/mach-k3/include/mach/am64_hardware.h
View File

@ -47,4 +47,6 @@
#define CTRLMMR_LOCK_KICK1 0x0100c
#define CTRLMMR_LOCK_KICK1_UNLOCK_VAL 0xd172bc5a
#define ROM_ENTENDED_BOOT_DATA_INFO 0x701beb00
#endif /* __ASM_ARCH_DRA8_HARDWARE_H */