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x86: Set the DRAM banks to reflect real location

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At present with fsp a single DRAM bank is added which extends to the
whole size of memory. However there is typically only 2GB of memory
available below the 4GB boundary, and this is what is used by U-Boot while
running in 32-bit mode.

Scan the tables to set the banks correct. The first bank is set to memory
below 4GB, and the rest of memory is put into subsequent banks.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2019-12-06 21:42:11 -07:00 committed by Bin Meng
parent 22e0de3551
commit ea4e97a511
1 changed files with 29 additions and 1 deletions
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30
arch/x86/lib/fsp/fsp_dram.c
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@ -38,8 +38,36 @@ int fsp_scan_for_ram_size(void)
int dram_init_banksize(void)
{
const struct hob_header *hdr;
struct hob_res_desc *res_desc;
phys_addr_t low_end;
uint bank;
low_end = 0;
for (bank = 1, hdr = gd->arch.hob_list;
bank < CONFIG_NR_DRAM_BANKS && !end_of_hob(hdr);
hdr = get_next_hob(hdr)) {
if (hdr->type != HOB_TYPE_RES_DESC)
continue;
res_desc = (struct hob_res_desc *)hdr;
if (res_desc->type != RES_SYS_MEM &&
res_desc->type != RES_MEM_RESERVED)
continue;
if (res_desc->phys_start < (1ULL << 32)) {
low_end = max(low_end,
res_desc->phys_start + res_desc->len);
continue;
}
gd->bd->bi_dram[bank].start = res_desc->phys_start;
gd->bd->bi_dram[bank].size = res_desc->len;
log_debug("ram %llx %llx\n", gd->bd->bi_dram[bank].start,
gd->bd->bi_dram[bank].size);
}
/* Add the memory below 4GB */
gd->bd->bi_dram[0].start = 0;
gd->bd->bi_dram[0].size = gd->ram_size;
gd->bd->bi_dram[0].size = low_end;
return 0;
}