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 cb1b84c..d5eaf67 100644 (file)
--- 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);