[U-Boot] [PATCH] Revert "common/memsize.c: Simplify RAM size detection"

["Eddy Petrișor" <eddy.petrisor@gmail.com>]

Hi Hans,

I sent a fixup patch yesterday (I managed somehow to send an outdated
patch), did you try the fixup patch?

http://lists.denx.de/pipermail/u-boot/2016-February/245080.html
Pe 9 feb. 2016 11:38 p.m., "Hans de Goede" <hdegoede@redhat.com> a scris:

> This commit breaks bootup on sunxi boards, the get stuck
> when running the main u-boot binary at:
>
> CPU:   Allwinner H3 (SUN8I)
> I2C:   ready
> DRAM:
>
> This reverts commit 8e7cba048baae68ee0916a8f52b4304277328d5e.
>
> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
> ---
>  common/memsize.c | 47 ++++++++++++++++++++++++++---------------------
>  1 file changed, 26 insertions(+), 21 deletions(-)
>
> diff --git a/common/memsize.c b/common/memsize.c
> index 5c0d279..0fb9ba5 100644
> --- a/common/memsize.c
> +++ b/common/memsize.c
> @@ -33,28 +33,38 @@ long get_ram_size(long *base, long maxsize)
>         long           size;
>         int            i = 0;
>
> -       for (cnt = (maxsize / sizeof(long)) >> 1; cnt >= 0; cnt >>= 1) {
> +       for (cnt = (maxsize / sizeof(long)) >> 1; cnt > 0; cnt >>= 1) {
>                 addr = base + cnt;      /* pointer arith! */
>                 sync();
> -               save[i] = *addr;
> +               save[i++] = *addr;
>                 sync();
> -               if (cnt) {
> -                       i++;
> -                       *addr = ~cnt;
> -               } else {
> -                       *addr = 0;
> -               }
> +               *addr = ~cnt;
>         }
>
> +       addr = base;
> +       sync();
> +       save[i] = *addr;
> +       sync();
> +       *addr = 0;
> +
>         sync();
> -       cnt = 0;
> -       do {
> +       if ((val = *addr) != 0) {
> +               /* Restore the original data before leaving the function.
> */
> +               sync();
> +               *addr = save[i];
> +               for (cnt = 1; cnt < maxsize / sizeof(long); cnt <<= 1) {
> +                       addr  = base + cnt;
> +                       sync();
> +                       *addr = save[--i];
> +               }
> +               return (0);
> +       }
> +
> +       for (cnt = 1; cnt < maxsize / sizeof(long); cnt <<= 1) {
>                 addr = base + cnt;      /* pointer arith! */
>                 val = *addr;
> -               *addr = save[i--];
> -               sync();
> -               if (((cnt == 0) && (val != 0)) ||
> -                   ((cnt != 0) && (val != ~cnt))) {
> +               *addr = save[--i];
> +               if (val != ~cnt) {
>                         size = cnt * sizeof(long);
>                         /*
>                          * Restore the original data
> @@ -64,16 +74,11 @@ long get_ram_size(long *base, long maxsize)
>                              cnt < maxsize / sizeof(long);
>                              cnt <<= 1) {
>                                 addr  = base + cnt;
> -                               *addr = save[i--];
> +                               *addr = save[--i];
>                         }
>                         return (size);
>                 }
> -
> -               if (cnt)
> -                       cnt = cnt << 1;
> -               else
> -                       cnt = 1;
> -       } while (cnt < maxsize / sizeof(long));
> +       }
>
>         return (maxsize);
>  }
> --
> 2.5.0
>
>