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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 <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Lukasz Majewski <l.majewski@samsung.com>
This commit is contained in:
Simon Glass 2015-03-02 12:40:49 -07:00
parent 4564faeafb
commit 892ff8e972
1 changed files with 4 additions and 2 deletions
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6
arch/x86/cpu/coreboot/sdram.c
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@ -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++;