Re: [PATCH v5 10/11] hw/arm: Wire up BMC boot flash for npcm750-evb and quanta-gsj

[Havard Skinnemoen]

On Wed, Jul 15, 2020 at 3:57 AM Philippe Mathieu-Daudé <f4bug@amsat.org> wrote:
>
> On 7/15/20 11:00 AM, Markus Armbruster wrote:
> > Now my point.  Why first make up user configuration, then use that to
> > create a BlockBackend, when you could just go ahead and create the
> > BlockBackend?
>
> CLI issue mostly.
>
> We can solve it similarly to the recent "sdcard: Do not allow invalid SD
> card sizes" patch:
>
>  if (!dinfo) {
>      error_setg(errp, "Missing SPI flash drive");
>      error_append_hint(errp, "You can use a dummy drive using:\n");
>      error_append_hint(errp, "-drive if=mtd,driver=null-co,"
>                              "read-ones=on,size=64M\n);
>      return;
>  }
>
> having npcm7xx_connect_flash() taking an Error* argument,
> and MachineClass::init() call it with &error_fatal.

Erroring out if the user specifies a configuration that can't possibly
boot sounds good to me. Better than trying to come up with defaults
that are still not going to result in a bootable system.

For testing recovery paths, I think it makes sense to explicitly
specify a null device as you suggest.

Havard