[PATCH v6 038/102] x86: Set the DRAM banks to reflect real location

[Simon Glass]

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 at chromium.org>
Reviewed-by: Bin Meng <bmeng.cn at gmail.com>
---

Changes in v6: None
Changes in v5: None
Changes in v4: None
Changes in v3:
- Move mtrr_add_request() call to next patch

Changes in v2: None

 arch/x86/lib/fsp/fsp_dram.c | 30 +++++++++++++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)

diff --git a/arch/x86/lib/fsp/fsp_dram.c b/arch/x86/lib/fsp/fsp_dram.c
index bc456bb4a9..987cb4f8f3 100644
--- a/arch/x86/lib/fsp/fsp_dram.c
+++ b/arch/x86/lib/fsp/fsp_dram.c
@@ -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;
 }
-- 
2.24.0.393.g34dc348eaf-goog