From f5ee0f2bf7b008dc92315c10239e8d537877c0de Mon Sep 17 00:00:00 2001 From: Marek Vasut Date: Sun, 9 Mar 2025 03:05:54 +0100 Subject: [PATCH] ARM: stm32mp: Fix dram_bank_mmu_setup() for ram_top=0 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: 25fb58e88aba ("ARM: stm32mp: Fix dram_bank_mmu_setup() for LMB located above ram_top") Signed-off-by: Marek Vasut Reviewed-by: Patrice Chotard --- arch/arm/mach-stm32mp/stm32mp1/cpu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm/mach-stm32mp/stm32mp1/cpu.c b/arch/arm/mach-stm32mp/stm32mp1/cpu.c index cb1b84c9af9..d5eaf6711b6 100644 --- a/arch/arm/mach-stm32mp/stm32mp1/cpu.c +++ b/arch/arm/mach-stm32mp/stm32mp1/cpu.c @@ -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); -- 2.39.5