sry for the delay, i was setting my homelab these day.
On Tue, Jan 14, 2025 at 01:10:42PM +0800, Huan Zhou wrote:
these content is from the cover letter and imo should be ignore during patch step.
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-v1-1-4bae32ecf756@per1cycle...
Signed-off-by: Huan Zhou me@per1cycle.org Tested-by: Marcel Ziswiler marcel@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 me@per1cycle.org