Configuration for specific board

[YuukiHogo]

What correct way to configure uboot sun4i branch for a board with 4x256MiB banks? Is this correct? include/configs/sun4i.h:

#define CONFIG_NR_DRAM_BANKS            4
#define CONFIG_SDRAM_SIZE                       (256 << 20)
#define PHYS_SDRAM_1                            CONFIG_SYS_SDRAM_BASE                   /* SDRAM Bank #1 */
#define PHYS_SDRAM_1_SIZE                       CONFIG_SDRAM_SIZE                       /* 0x10000000, 256 MB Bank #1 */
#define PHYS_SDRAM_2                            (PHYS_SDRAM_1 + PHYS_SDRAM_1_SIZE)      /* SDRAM Bank #2 */
#define PHYS_SDRAM_2_SIZE                       CONFIG_SDRAM_SIZE                       /* 0x10000000, 256 MB Bank #2 */
#define PHYS_SDRAM_3                            (PHYS_SDRAM_2 + PHYS_SDRAM_2_SIZE)      /* SDRAM Bank #3 */
#define PHYS_SDRAM_3_SIZE                       CONFIG_SDRAM_SIZE                       /* 0x10000000, 256 MB Bank #3 */
#define PHYS_SDRAM_4                            (PHYS_SDRAM_3 + PHYS_SDRAM_3_SIZE)      /* SDRAM Bank #4 */
#define PHYS_SDRAM_4_SIZE                       CONFIG_SDRAM_SIZE                       /* 0x10000000, 256 MB Bank #4 */

board/allwinner/a10-evb/a10-evb.c:

void dram_init_banksize(void) {

        gd->bd->bi_dram[0].start = PHYS_SDRAM_1;
        gd->bd->bi_dram[0].size = PHYS_SDRAM_1_SIZE;
        gd->bd->bi_dram[1].start = PHYS_SDRAM_2;
        gd->bd->bi_dram[1].size = PHYS_SDRAM_2_SIZE;
        gd->bd->bi_dram[2].start = PHYS_SDRAM_3;
        gd->bd->bi_dram[2].size = PHYS_SDRAM_3_SIZE;
        gd->bd->bi_dram[3].start = PHYS_SDRAM_4;
        gd->bd->bi_dram[3].size = PHYS_SDRAM_4_SIZE;
}

int dram_init(void) {

        gd->ram_size = get_ram_size((long *)PHYS_SDRAM_1, PHYS_SDRAM_1_SIZE)
                     + get_ram_size((long *)PHYS_SDRAM_2, PHYS_SDRAM_2_SIZE)
                     + get_ram_size((long *)PHYS_SDRAM_3, PHYS_SDRAM_3_SIZE)
                     + get_ram_size((long *)PHYS_SDRAM_4, PHYS_SDRAM_4_SIZE);
        return 0;
}

[hno]

tis 2012-09-18 klockan 08:52 -0700 skrev YuukiHogo:

What correct way to configure uboot for a board with 4x256MiB banks?

That's actually one bank of 4 chips.

There is two parts that need to fit together

a) The dram controller initialization, matching how the DRAM is wired on your board.

b) bd->bi_dram[] bank configuration.

The details of 'a' is in dram-sun?i.c.

The details of 'b' is in the board sources.

For 'b' you have three options

a) Ignore it, and use a kernel that builds it's own memory info by probing the DRAM controller (ugly, but easy)

b) Configure it as one large 1GB bank.

c) Configure is as one 512-64MB bank and one 512MB bank, for the memory layout expected by MALI.

Regards Henrik

[YuukiHogo]

Thanks. I configured it as 1x1GiB bank, but dunno how to check/configure wiring. It seems too deep for me.

Ugly kernel-dram-detect way is unstable - different boots show different dram configurations.

[hno]

Memory configuration have changed significantly, and is now easier to set up. Please see current sunxi branch where there is board/allwinner/ folders with per-board configuration.