[U-Boot] [PATCH V2 10/13] spl: add support for alternative boot device

[Nikita Kiryanov <nikita@compulab.co.il>]

On Thu, Oct 29, 2015 at 11:19:51AM -0600, Simon Glass wrote:
> Hi Nikita,
> 
> On 28 October 2015 at 03:23, Nikita Kiryanov <nikita@compulab.co.il> wrote:
> > Introduce spl_boot_list array, which defines a list of boot devices
> > that SPL will try before hanging. By default this list will consist
> > of only spl_boot_device(), but board_boot_order() can be overridden
> > by board code to populate the array with custom values.
> >
> > Signed-off-by: Nikita Kiryanov <nikita@compulab.co.il>
> > Cc: Igor Grinberg <grinberg@compulab.co.il>
> > Cc: Tom Rini <trini@konsulko.com>
> > Cc: Simon Glass <sjg@chromium.org>
> > ---
> > Changes in V2:
> >         - No changes.
> >
> >  common/spl/spl.c | 33 +++++++++++++++++++++++++++++----
> >  1 file changed, 29 insertions(+), 4 deletions(-)
> 
> How will we convert this to driver model? I'm worried that this might
> create a separate method which will live forever.

I don't see how this is related to driver model. This code just fills in
an array and iterates over it. Can you elaborate?

> 
> >
> > diff --git a/common/spl/spl.c b/common/spl/spl.c
> > index 56fccca..7913c52 100644
> > --- a/common/spl/spl.c
> > +++ b/common/spl/spl.c
> > @@ -178,6 +178,23 @@ int spl_init(void)
> >         return 0;
> >  }
> >
> > +#ifndef BOOT_DEVICE_NONE
> > +#define BOOT_DEVICE_NONE 0xdeadbeef
> > +#endif
> > +
> > +static u32 spl_boot_list[] = {
> > +       BOOT_DEVICE_NONE,
> > +       BOOT_DEVICE_NONE,
> > +       BOOT_DEVICE_NONE,
> > +       BOOT_DEVICE_NONE,
> > +       BOOT_DEVICE_NONE,
> > +};
> > +
> > +__weak void board_boot_order(u32 *spl_boot_list)
> > +{
> > +       spl_boot_list[0] = spl_boot_device();
> > +}
> > +
> >  static int spl_load_image(u32 boot_device)
> >  {
> >         switch (boot_device) {
> > @@ -247,7 +264,7 @@ static int spl_load_image(u32 boot_device)
> >
> >  void board_init_r(gd_t *dummy1, ulong dummy2)
> >  {
> > -       u32 boot_device;
> > +       int i;
> >
> >         debug(">>spl:board_init_r()\n");
> >
> > @@ -272,10 +289,18 @@ void board_init_r(gd_t *dummy1, ulong dummy2)
> >         spl_board_init();
> >  #endif
> >
> > -       boot_device = spl_boot_device();
> > -       debug("boot device - %d\n", boot_device);
> > -       if (spl_load_image(boot_device))
> > +       board_boot_order(spl_boot_list);
> > +       for (i = 0; i < ARRAY_SIZE(spl_boot_list) &&
> > +                       spl_boot_list[i] != BOOT_DEVICE_NONE; i++) {
> > +               if (!spl_load_image(spl_boot_list[i]))
> > +                       break;
> > +       }
> > +
> > +       if (i == ARRAY_SIZE(spl_boot_list) ||
> > +           spl_boot_list[i] == BOOT_DEVICE_NONE) {
> > +               puts("SPL: failed to boot from all boot devices\n");
> >                 hang();
> > +       }
> >
> >         switch (spl_image.os) {
> >         case IH_OS_U_BOOT:
> > --
> > 1.9.1
> >
> 
> Regards,
> Simon
>