[Buildroot] [PATCH 2/2] board/sifive: Update hifive_unleashed_defconfig and genimage.cfg

[Bin Meng]

Hi Thomas,

On Sun, Jan 17, 2021 at 5:42 AM Thomas Petazzoni
<thomas.petazzoni at bootlin.com> wrote:
>
> Hello Bin,
>
> On Mon, 11 Jan 2021 17:01:12 +0800
> Bin Meng <bmeng.cn at gmail.com> wrote:
>
> > diff --git a/board/sifive/hifive-unleashed/genimage_spi-nor.cfg b/board/sifive/hifive-unleashed/genimage_spi-nor.cfg
> > new file mode 100644
> > index 0000000..7f90997
> > --- /dev/null
> > +++ b/board/sifive/hifive-unleashed/genimage_spi-nor.cfg
> > @@ -0,0 +1,25 @@
> > +image spi-nor.img {
> > +     size = 32M
> > +
> > +     hdimage {
> > +             gpt = true
> > +     }
> > +
> > +     partition u-boot-spl {
> > +             image = "u-boot-spl.bin"
> > +             offset = 20K
> > +             partition-type-uuid = 5B193300-FC78-40CD-8002-E86C45580B47
> > +     }
> > +
> > +     partition u-boot {
> > +             image = "u-boot.itb"
> > +             offset = 1044K
> > +             partition-type-uuid = 2E54B353-1271-4842-806F-E436D6AF6985
> > +     }
> > +
> > +     partition rootfs {
> > +             image = "rootfs.ext4"
> > +             partition-type-uuid = 0FC63DAF-8483-4772-8E79-3D69D8477DE4
> > +             bootable = true
> > +     }
> > +}
>
> This looks strange. You really use a GPT partition table on SPI flash,
> and use an ext4 filesystem on a SPI flash ?
>

When booting from SPI flash, the GPT partition is required by the ZSBL
on the board to load U-Boot SPL images. The kernel still uses ext4 on
the SD card as the rootfs. The SPI flash is just the backup for the
rootfs.

Regards,
Bin