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arm: K3: Avoid use of MCU_PSRAM0 before SYSFW is loaded

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On HS devices the 512b region of reset isolated memory called
MCU_PSRAM0 is firewalled by default. Until SYSFW is loaded we
cannot use this memory. It is only used to store a single value
left at the end of SRAM by ROM that will be needed later. Save
that value to a global variable stored in the .data section.
This section is used as .bss will be cleared between saving
this value and using it.

Signed-off-by: Andrew F. Davis <afd@ti.com>
Reviewed-by: Andreas Dannenberg <dannenberg@ti.com>
Reviewed-by: Lokesh Vutla <lokeshvutla@ti.com>
This commit is contained in:
Andrew F. Davis 2019-04-12 12:54:42 -04:00 committed by Tom Rini
parent b07cc48ca1
commit 407a219261
2 changed files with 8 additions and 8 deletions
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13
arch/arm/mach-k3/am6_init.c
View File

@ -49,11 +49,16 @@ static void ctrl_mmr_unlock(void)
mmr_unlock(CTRL_MMR0_BASE, 7);
}
/*
* 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 __attribute__((section(".data")));
static void store_boot_index_from_rom(void)
{
u32 *boot_index = (u32 *)K3_BOOT_PARAM_TABLE_INDEX_VAL;
*boot_index = *(u32 *)(CONFIG_SYS_K3_BOOT_PARAM_TABLE_INDEX);
bootindex = *(u32 *)(CONFIG_SYS_K3_BOOT_PARAM_TABLE_INDEX);
}
void board_init_f(ulong dummy)
@ -92,7 +97,6 @@ u32 spl_boot_mode(const u32 boot_device)
{
#if defined(CONFIG_SUPPORT_EMMC_BOOT)
u32 devstat = readl(CTRLMMR_MAIN_DEVSTAT);
u32 bootindex = readl(K3_BOOT_PARAM_TABLE_INDEX_VAL);
u32 bootmode = (devstat & CTRLMMR_MAIN_DEVSTAT_BOOTMODE_MASK) >>
CTRLMMR_MAIN_DEVSTAT_BOOTMODE_SHIFT;
@ -168,7 +172,6 @@ static u32 __get_primary_bootmedia(u32 devstat)
u32 spl_boot_device(void)
{
u32 devstat = readl(CTRLMMR_MAIN_DEVSTAT);
u32 bootindex = readl(K3_BOOT_PARAM_TABLE_INDEX_VAL);
if (bootindex == K3_PRIMARY_BOOTMODE)
return __get_primary_bootmedia(devstat);

3
arch/arm/mach-k3/include/mach/am6_hardware.h
View File

@ -44,7 +44,4 @@
#define CTRLMMR_LOCK_KICK1 0x0100c
#define CTRLMMR_LOCK_KICK1_UNLOCK_VAL 0xd172bc5a
/* MCU SCRATCHPAD usage */
#define K3_BOOT_PARAM_TABLE_INDEX_VAL CONFIG_SYS_K3_MCU_SCRATCHPAD_BASE
#endif /* __ASM_ARCH_AM6_HARDWARE_H */