Hi Huan Zhou
Thanks!
On Wed, 2025-01-08 at 16:49 +0800, Huan Zhou wrote:
>
> ---
> This patch introduce improvement for get dram size on bananapi BPI-F3,
> retrieving the dram size dynamically.
> Have tested on bananapi BPIF3 4G and jupiter 8G.
>
> 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..095217f2a4c053f7477d62c0776bcb51e623db47
> 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 u32 map_format_size(u32 val)
> +{
> + u32 tmp;
> +
> + if (val & 0x1 == 0)
> + 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;
> + }
> +}
> +
> +u32 ddr_get_density(void)
> +{
> + u32 cs0_size = map_format_size(readl((void *)DDR_BASE + 0x200));
> + u32 cs1_size = map_format_size(readl((void *)DDR_BASE + 0x208));
> + u32 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 = (u64)ddr_get_density() * SZ_1M;
> return 0;
> }
>
>
> ---
> base-commit: 19fc0b7f7d907119a13e9c207991899f0817f8fc
> change-id: 20250108-get-dram-size-65cf59a15201
>
> Best regards,
> --
> Huan Zhou <m...@per1cycle.org>
Cheers
Marcel
