[PATCH 1/1] smbios: add extended Extended BIOS ROM Size

[Mark Kettenis]

> Date: Tue, 23 Jul 2024 22:12:57 +0200
> From: Mark Kettenis <mark.kettenis at xs4all.nl>
> 
> > From: Heinrich Schuchardt <heinrich.schuchardt at canonical.com>
> > Date: Tue, 23 Jul 2024 12:46:34 +0200
> > 
> > U-Boot claims to create SMBIOS 3.7 tables. The type 0 table has
> > a field Extended BIOS ROM Size since version 3.1.
> > 
> > BIOS ROM sizes of 16 MiB or above must be written to this field.
> > 
> > Add and fill the missing field.
> > 
> > This patch does not cover the case of a ROM >= 8 GiB which cannot
> > be configured in U-Boot.
> > 
> > Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt at canonical.com>
> > ---
> >  include/smbios.h | 1 +
> >  lib/smbios.c     | 9 ++++++++-
> >  2 files changed, 9 insertions(+), 1 deletion(-)
> > 
> > diff --git a/include/smbios.h b/include/smbios.h
> > index a4fda9df7bd..00119d7a60c 100644
> > --- a/include/smbios.h
> > +++ b/include/smbios.h
> > @@ -105,6 +105,7 @@ struct __packed smbios_type0 {
> >  	u8 bios_minor_release;
> >  	u8 ec_major_release;
> >  	u8 ec_minor_release;
> > +	u16 extended_bios_rom_size;
> >  	char eos[SMBIOS_STRUCT_EOS_BYTES];
> >  };
> >  
> > diff --git a/lib/smbios.c b/lib/smbios.c
> > index 4126466e34a..e2a2f873a94 100644
> > --- a/lib/smbios.c
> > +++ b/lib/smbios.c
> > @@ -348,7 +348,14 @@ static int smbios_write_type0(ulong *current, int handle,
> >  #endif
> >  	t->bios_release_date = smbios_add_prop(ctx, NULL, U_BOOT_DMI_DATE);
> >  #ifdef CONFIG_ROM_SIZE
> > -	t->bios_rom_size = (CONFIG_ROM_SIZE / 65536) - 1;
> > +	if (CONFIG_ROM_SIZE < 0x1000000) {
> > +		/* CONFIG_ROM_SIZE < 16 MiB */
> > +		t->bios_rom_size = (CONFIG_ROM_SIZE / 65536) - 1;
> > +	} else {
> > +		/* CONFIG_ROM_SIZE < 8 GiB */
> 
> I don't think that comment is true ;).

Uh, never mind, MiB vs. GiB.  Sorry for the noise.

> > +		t->bios_rom_size = 0xff;
> > +		t->extended_bios_rom_size = CONFIG_ROM_SIZE >> 20;
> > +	}
> >  #endif
> >  	t->bios_characteristics = BIOS_CHARACTERISTICS_PCI_SUPPORTED |
> >  				  BIOS_CHARACTERISTICS_SELECTABLE_BOOT |
> > -- 
> > 2.45.2
> > 
> > 
>