[U-Boot] ** Can't read Driver Desriptor Block **

[Bin Meng]

Hi Heinrich,

On Wed, Aug 30, 2017 at 4:26 AM, Heinrich Schuchardt <xypron.glpk at gmx.de> wrote:
> Hello Simon,
>
> U-Boot HEAD qemu-86_defconfig cannot discover an IDE disk with one FAT
> partition in qemu-system-x86_64.
>
> By bisection I found this patch.
>
> b7c6baef2891ce8978cbfddb66e944943473ac21
> x86: Convert MMC to driver model
>
> With this patch I get
>
> IDE:   Bus 0: OK Bus 1: OK
>   Device 0: Model: QEMU HARDDISK  Firm: 2.5+ Ser#: QM00001
>             Type: Hard Disk
>             Supports 48-bit addressing
>             Capacity: 128.0 MB = 0.1 GB (262144 x 512)
> ** Can't read Driver Desriptor Block **
>   Device 1: not available
>   Device 2: Model: QEMU Firm: 2.5+ Ser#: QEMU DVD-ROM
>             Type: Removable CD ROM
>             Capacity: not available
>   Device 3: not available
>
> => ide info
> =>
>
> Without the patch I get=> ide info
> Device 0: Model: QEMU HARDDISK  Firm: 2.5+ Ser#: QM00001
>             Type: Hard Disk
>             Supports 48-bit addressing
>             Capacity: 128.0 MB = 0.1 GB (262144 x 512)
> Device 2: Model: QEMU Firm: 2.5+ Ser#: QEMU DVD-ROM
>             Type: Removable CD ROM
>             Capacity: not available
>
> I think we observe two independent errors here:
>
> - The hard disk Device 0 is not read.
> - The ide command stops at the first device that is not available.
>
> I guess only the first is caused by your patch.

Both logs look fine to me. The "Can't read Driver Desriptor Block"
comes from part_mac.c. Did you verify the actual IDE read/write fails
with current HEAD?

Regards,
Bin