From: Marek Vasut <marex@denx.de>
Date: Sun, 9 Mar 2025 02:05:54 +0000 (+0100)
Subject: ARM: stm32mp: Fix dram_bank_mmu_setup() for ram_top=0
X-Git-Tag: v2025.04-rc4~2^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f5ee0f2bf7b008dc92315c10239e8d537877c0de;p=pandora-u-boot.git

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 <marex@denx.de>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
---

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);