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imx: Fix potential lmb memory overwritten by stack

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At default, u-boot reserves the memory from SP - 4KB to DRAM end for
lmb in arch_lmb_reserve. So lmb won't allocate any memory from it.
But we found the 4K gap for SP is not enough now, because some FDT
updating operations are added in our u-boot before jumping to kernel,
which needs larger stack. This causes the lmb allocated memory is overwritten
by stack.

Fix the issue by implementing the board_lmb_reserve to reserve from
SP - 16KB to memory end for lmb.

Signed-off-by: Ye Li <ye.li@nxp.com>
This commit is contained in:
Ye Li 2019-01-04 09:10:20 +00:00 committed by Stefano Babic
parent 11a1c27eb4
commit 528915c717
1 changed files with 32 additions and 0 deletions
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32
arch/arm/mach-imx/misc.c
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@ -9,6 +9,8 @@
#include <asm/io.h>
#include <asm/mach-imx/regs-common.h>
DECLARE_GLOBAL_DATA_PTR;
/* 1 second delay should be plenty of time for block reset. */
#define RESET_MAX_TIMEOUT 1000000
@ -71,3 +73,33 @@ int mxs_reset_block(struct mxs_register_32 *reg)
return 0;
}
static ulong get_sp(void)
{
ulong ret;
asm("mov %0, sp" : "=r"(ret) : );
return ret;
}
void board_lmb_reserve(struct lmb *lmb)
{
ulong sp, bank_end;
int bank;
sp = get_sp();
debug("## Current stack ends at 0x%08lx ", sp);
/* adjust sp by 16K to be safe */
sp -= 4096 << 2;
for (bank = 0; bank < CONFIG_NR_DRAM_BANKS; bank++) {
if (sp < gd->bd->bi_dram[bank].start)
continue;
bank_end = gd->bd->bi_dram[bank].start +
gd->bd->bi_dram[bank].size;
if (sp >= bank_end)
continue;
lmb_reserve(lmb, sp, bank_end - sp);
break;
}
}