[PATCH 2/6] sunxi: fix 32MB load address layout

[Jernej Škrabec]

Hi Andre,

Dne sreda, 12. oktober 2022 ob 18:34:54 CEST je Andre Przywara napisal(a):
> The default load addresses for the various payloads (kernel, DT,
> ramdisk) on systems with just 32MB of DRAM have some issues:
> For a start the preceding comment doesn't match the actual values:
> apparently they were copied from the 64MB S3 layout, then halved, but
> since 0x5 is NOT the half of 0x10, they don't match up.
> Also those projected maximum sizes are quite restrictive: it's not easy
> to build a compressed kernel image with just 4MB. The only defconfig in
> mainline Linux that supports the F1C100s (the only 32MB user so far)
> creates a 6MB compressed / 15MB uncompressed kernel.
> Rearrange the default load addresses to accommodate such a kernel: we
> allow an 7MB/16MB kernel, and up to 5MB of ramdisk, stuffing the smaller
> binaries like the DTB towards the end, just before the relocated U-Boot.
> Shrink the size for DTB and scripts on the way, there is no need for
> allowing up to 512K for them.
> 
> Signed-off-by: Andre Przywara <andre.przywara at arm.com>
> ---
>  include/configs/sunxi-common.h | 18 +++++++++---------
>  1 file changed, 9 insertions(+), 9 deletions(-)
> 
> diff --git a/include/configs/sunxi-common.h b/include/configs/sunxi-common.h
> index 416a0422861..fe90d55bd45 100644
> --- a/include/configs/sunxi-common.h
> +++ b/include/configs/sunxi-common.h
> @@ -165,17 +165,17 @@
> 
>  #elif (CONFIG_SUNXI_MINIMUM_DRAM_MB >= 32)
>  /*
> - * 32M RAM minus 1MB heap + 8MB for u-boot, stack, fb, etc.
> - * 8M uncompressed kernel, 4M compressed kernel, 512K fdt,
> - * 512K script, 512K pxe and the ramdisk at the end.
> + * 32M RAM minus 2.5MB for u-boot, heap, stack, etc.
> + * 16M uncompressed kernel, 7M compressed kernel, 128K fdt, 64K script,
> + * 128K DT overlay, 128K PXE and the ramdisk in the rest (max. 5MB)

DT overlays and PXE could be even much smaller, but I guess it doesn't make 
much of a difference.

Reviewed-by: Jernej Skrabec <jernej.skrabec at gmail.com>

Best regards,
Jernej

>   */
>  #define BOOTM_SIZE        __stringify(0x1700000)
> -#define KERNEL_ADDR_R     __stringify(SDRAM_OFFSET(0500000))
> -#define FDT_ADDR_R        __stringify(SDRAM_OFFSET(0C00000))
> -#define SCRIPT_ADDR_R     __stringify(SDRAM_OFFSET(0C50000))
> -#define PXEFILE_ADDR_R    __stringify(SDRAM_OFFSET(0D00000))
> -#define FDTOVERLAY_ADDR_R __stringify(SDRAM_OFFSET(0D50000))
> -#define RAMDISK_ADDR_R    __stringify(SDRAM_OFFSET(0D60000))
> +#define KERNEL_ADDR_R     __stringify(SDRAM_OFFSET(1000000))
> +#define FDT_ADDR_R        __stringify(SDRAM_OFFSET(1d50000))
> +#define SCRIPT_ADDR_R     __stringify(SDRAM_OFFSET(1d40000))
> +#define PXEFILE_ADDR_R    __stringify(SDRAM_OFFSET(1d00000))
> +#define FDTOVERLAY_ADDR_R __stringify(SDRAM_OFFSET(1d20000))
> +#define RAMDISK_ADDR_R    __stringify(SDRAM_OFFSET(1800000))
> 
>  #else
>  #error Need at least 32MB of DRAM. Please adjust load addresses.
> --
> 2.25.1