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ARM: stm32mp: Fix dram_bank_mmu_setup() for ram_top=0

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On STM32MP15xx with 1 GiB of DRAM, the gd->ram_top becomes 0,
because DRAM base 0xc0000000 + DRAM size 0x40000000 leads to
gd->ram_top overflow which resets it to 0. Handle this special
case simply by checking for gd->ram_top being zero, and if it
is, assume there is no addr >= gd->ram_top .

This fixes boot hang on STM32MP15xx with 1 GiB of DRAM.

Fixes: 25fb58e88a ("ARM: stm32mp: Fix dram_bank_mmu_setup() for LMB located above ram_top")
Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
This commit is contained in:
Marek Vasut 2025-03-09 03:05:54 +01:00 • committed by Patrice Chotard
parent dc0ee458f1
commit f5ee0f2bf7
1 changed files with 1 additions and 1 deletions
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arch/arm/mach-stm32mp/stm32mp1/cpu.c
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@ -82,7 +82,7 @@ void dram_bank_mmu_setup(int bank)
option = DCACHE_DEFAULT_OPTION;
if (use_lmb &&
(lmb_is_reserved_flags(i << MMU_SECTION_SHIFT, LMB_NOMAP) ||
addr >= gd->ram_top)
(gd->ram_top && addr >= gd->ram_top))
)
option = 0; /* INVALID ENTRY in TLB */
set_section_dcache(i, option);