[U-Boot] [PATCH] disk: part_dos: Use the original allocation scheme for the SPL case

[Peter Robinson]

On Wed, Oct 4, 2017 at 5:29 PM, Fabio Estevam <fabio.estevam at nxp.com> wrote:
> Since commit ff98cb90514d ("part: extract MBR signature from partitions")
> SPL boot on i.MX6 starts to fail:
>
> U-Boot SPL 2017.09-00221-g0d6ab32 (Oct 02 2017 - 15:13:19)
> Trying to boot from MMC1
> (keep in loop)
>
> Use the original allocation scheme for the SPL case, so that MX6 boards
> can boot again.
>
> This is a temporary solution to avoid the boot regression.
>
> Signed-off-by: Fabio Estevam <fabio.estevam at nxp.com>
Tested-by: Peter Robinson <pbrobinson at gmail.com>

Tested on both a wandboard quad and a hummingboard2 (mx6cuboxi) and it
works for me.

Peter

> ---
> Hi Tom,
>
> I do not have time this week to further investigate and narrow down
> this problem.
>
> Using the old allocation scheme fixes the mx6 SPL boot problem.
>
>
>  disk/part_dos.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
>
> diff --git a/disk/part_dos.c b/disk/part_dos.c
> index 1a36be0..6dd2c2d 100644
> --- a/disk/part_dos.c
> +++ b/disk/part_dos.c
> @@ -89,6 +89,7 @@ static int test_block_type(unsigned char *buffer)
>
>  static int part_test_dos(struct blk_desc *dev_desc)
>  {
> +#ifndef CONFIG_SPL_BUILD
>         ALLOC_CACHE_ALIGN_BUFFER(legacy_mbr, mbr, dev_desc->blksz);
>
>         if (blk_dread(dev_desc, 0, 1, (ulong *)mbr) != 1)
> @@ -102,6 +103,15 @@ static int part_test_dos(struct blk_desc *dev_desc)
>                 dev_desc->sig_type = SIG_TYPE_MBR;
>                 dev_desc->mbr_sig = mbr->unique_mbr_signature;
>         }
> +#else
> +       ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
> +
> +       if (blk_dread(dev_desc, 0, 1, (ulong *)buffer) != 1)
> +               return -1;
> +
> +       if (test_block_type(buffer) != DOS_MBR)
> +               return -1;
> +#endif
>
>         return 0;
>  }
> --
> 2.7.4
>
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