---
This patch introduce improvement for get dram size on bananapi BPI-F3,
retrieving the dram size dynamically.
Have tested on bananapi Licheepi LPI3A 8G[1].
Links:
[1] https://gist.github.com/per1cycle/e4eab66ebb6f83fe5118e823367fce28 .
Changes in v2:
- Fix bracker and return type in map_format_size() function.
- Add test log in the cover letter..
- Link to v1:
https://lore.kernel.org/r/20250108-get-dram-size-v1-1-4bae32ecf...@per1cycle.org
Signed-off-by: Huan Zhou <m...@per1cycle.org>
Tested-by: Marcel Ziswiler <mar...@ziswiler.com> # BPI-F3 16G
---
arch/riscv/cpu/k1/dram.c | 40 ++++++++++++++++++++++++++++++++++++++--
1 file changed, 38 insertions(+), 2 deletions(-)
diff --git a/arch/riscv/cpu/k1/dram.c b/arch/riscv/cpu/k1/dram.c
index
c477c15cbfb19f0e3a0ee72985b602f5bda352d7..4140440255fa1b3dbae521c58c6809445499a463
100644
--- a/arch/riscv/cpu/k1/dram.c
+++ b/arch/riscv/cpu/k1/dram.c
@@ -4,17 +4,53 @@
*/
#include <asm/global_data.h>
+#include <asm/io.h>
#include <config.h>
+#include <bitfield.h>
#include <fdt_support.h>
#include <linux/sizes.h>
+#define DDR_BASE 0xC0000000
DECLARE_GLOBAL_DATA_PTR;
+static inline phys_size_t map_format_size(u32 val)
+{
+ u32 tmp;
+
+ if (!(val & 0x1))
+ return 0;
+
+ tmp = bitfield_extract(val, 16, 5);
+ switch (tmp) {
+ case 0xd:
+ return 512;
+ case 0xe:
+ return 1024;
+ case 0xf:
+ return 2048;
+ case 0x10:
+ return 4096;
+ case 0x11:
+ return 8192;
+ default:
+ pr_info("Invalid DRAM density %x\n", val);
+ return 0;
+ }
+}
+
+phys_size_t ddr_get_density(void)
+{
+ phys_size_t cs0_size = map_format_size(readl((void *)DDR_BASE + 0x200));
+ phys_size_t cs1_size = map_format_size(readl((void *)DDR_BASE + 0x208));
+ phys_size_t ddr_size = cs0_size + cs1_size;
+
+ return ddr_size;
+}
+
int dram_init(void)
{
gd->ram_base = CFG_SYS_SDRAM_BASE;
- /* TODO get ram size from ddr controller */
- gd->ram_size = SZ_4G;
+ gd->ram_size = ddr_get_density() * SZ_1M;
return 0;
}
---
base-commit: 19fc0b7f7d907119a13e9c207991899f0817f8fc
change-id: 20250108-get-dram-size-65cf59a15201
Best regards,
--
Huan Zhou <m...@per1cycle.org>
