[U-Boot] [PATCH] riscv: ax25-ae350: Pass dtb address to u-boot with a1 register

[Rick Chen]

Bin Meng <bmeng.cn at gmail.com> 於 2018年10月25日 週四 上午10:33寫道：
>
> Hi Rick,
>
> On Thu, Oct 25, 2018 at 9:20 AM Andes <uboot at andestech.com> wrote:
> >
> > From: Rick Chen <rick at andestech.com>
> >
> > ax25-ae350 use CONFIG_OF_BOARD which allow the board to
> > override the fdt address. And prior_stage_fdt_address offer
> > a temporary memory address to keep the dtb address which was
> > passed from loader(gdb) to u-boot with a1.
>
> nits: U-Boot
>
> >
> > Signed-off-by: Rick Chen <rick at andestech.com>
> > Cc: Greentime Hu <greentime at andestech.com>
> > ---
> >  board/AndesTech/ax25-ae350/ax25-ae350.c | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/board/AndesTech/ax25-ae350/ax25-ae350.c b/board/AndesTech/ax25-ae350/ax25-ae350.c
> > index 5f4ca0f..d343453 100644
> > --- a/board/AndesTech/ax25-ae350/ax25-ae350.c
> > +++ b/board/AndesTech/ax25-ae350/ax25-ae350.c
> > @@ -14,6 +14,7 @@
> >
> >  DECLARE_GLOBAL_DATA_PTR;
> >
> > +extern phys_addr_t prior_stage_fdt_address;
> >  /*
> >   * Miscellaneous platform dependent initializations
> >   */
> > @@ -66,7 +67,7 @@ ulong board_flash_get_legacy(ulong base, int banknum, flash_info_t *info)
> >
> >  void *board_fdt_blob_setup(void)
> >  {
> > -       void **ptr = (void *)CONFIG_SYS_SDRAM_BASE;
> > +       void **ptr = (void *)&prior_stage_fdt_address;
> >         if (fdt_magic(*ptr) == FDT_MAGIC)
> >                         return (void *)*ptr;
> >
> > --
>
> board_fdt_blob_setup() should be completely removed. Instead the
> simple fix should be add CONFIG_OF_PRIOR_STAGE to your board defconfig
> files.
>

Hi Bin

I have tried to switch from CONFIG_OF_BOARD to CONFIG_OF_PRIOR_STAGE.

But it will lost the function
that dtb will be pre-burned into designated flash location,
when U-Boot was booting from flash.

How can I achieve that with CONFIG_OF_PRIOR_STAGE ?

Rick

> Regards,
> Bin