Re: [PATCH 0/3] board: sophgo: milkv_duo: enable standard boot

[Yao Zi <me@ziyao.cc>]

On Tue, Sep 29, 2026 at 07:20:30PM -0300, Hiago De Franco wrote:
> The Milk-V Duo (CV1800B, 64MB) does not enable CONFIG_BOOTSTD_DEFAULTS
> and has no environment file, so U-Boot has no bootcmd and none of the
> kernel_addr_r, fdt_addr_r, ramdisk_addr_r, ... variables required by
> the extlinux bootmeth.
> 
> Enable CONFIG_BOOTSTD_DEFAULTS and add a milkv_duo.env with a memory
> layout that fits into the 64MB of DRAM:
> 
>   0x80200000  kernel_addr_r       (16MB)
>   0x81200000  kernel_comp_addr_r  (16MB, Image.gz decompression)
>   0x82200000  fdt_addr_r
>   0x82300000  scriptaddr
>   0x82400000  pxefile_addr_r
>   0x82500000  ramdisk_addr_r
> 
> Also reduce CONFIG_STACK_SIZE to 1MB. LMB reserves CONFIG_STACK_SIZE
> below the relocated stack pointer, and the default 16MB left only about
> 1.4MB between ramdisk_addr_r and the reserved region. With 1MB, about
> 16MB are available for an initrd.
> 
> This series depends on Zhuxu Ran's "riscv: sophgo: Use upstream
> devicetrees for CV18xx boards" (v5), which sets CONFIG_DEFAULT_DEVICE_TREE
> to sophgo/<board>, so that fdtfile matches the Linux devicetree install
> path (sophgo/cv1800b-milkv-duo.dtb and sophgo/sg2002-milkv-duo256m.dtb).
> 
> Link: https://lore.kernel.org/all/20260927-milkv-duo-upstream-dts-v5-0-7f64983e59e1@zohomail.com/
> 
> Tested on Milk-V Duo, booting Linux through "bootflow scan" and an
> extlinux.conf on the SD card.
> 
> Signed-off-by: Hiago De Franco <hfranco@baylibre.com>

For the series,

Reviewed-by: Yao Zi <me@ziyao.cc>

Thanks,
Yao Zi