From: Simon Glass Date: Mon, 2 Mar 2015 19:40:49 +0000 (-0700) Subject: x86: Support machines with >4GB of RAM X-Git-Tag: v2015.07-rc1~343 X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=892ff8e972efc7d4f42750e4fdbb2c2fefb78229;p=oweals%2Fu-boot.git x86: Support machines with >4GB of RAM Some systems have more than 4GB of RAM. U-Boot can only place things below 4GB so any memory above that should not be used. Ignore any such memory so that the memory size will not exceed the maximum. This prevents gd->ram_size exceeding 4GB which causes problems for PCI devices which use DMA. Signed-off-by: Simon Glass Reviewed-by: Bin Meng Reviewed-by: Lukasz Majewski --- diff --git a/arch/x86/cpu/coreboot/sdram.c b/arch/x86/cpu/coreboot/sdram.c index e98a2302e7..9c3ab81734 100644 --- a/arch/x86/cpu/coreboot/sdram.c +++ b/arch/x86/cpu/coreboot/sdram.c @@ -90,7 +90,8 @@ int dram_init(void) struct memrange *memrange = &lib_sysinfo.memrange[i]; unsigned long long end = memrange->base + memrange->size; - if (memrange->type == CB_MEM_RAM && end > ram_size) + if (memrange->type == CB_MEM_RAM && end > ram_size && + memrange->base < (1ULL << 32)) ram_size = end; } gd->ram_size = ram_size; @@ -108,7 +109,8 @@ void dram_init_banksize(void) for (i = 0, j = 0; i < lib_sysinfo.n_memranges; i++) { struct memrange *memrange = &lib_sysinfo.memrange[i]; - if (memrange->type == CB_MEM_RAM) { + if (memrange->type == CB_MEM_RAM && + memrange->base < (1ULL << 32)) { gd->bd->bi_dram[j].start = memrange->base; gd->bd->bi_dram[j].size = memrange->size; j++;