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

[Simon Glass]

Hi,

On 30 August 2017 at 09:54, Bin Meng <bmeng.cn at gmail.com> wrote:
> 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?

We should definitely change that message to debug(). It is very
confusing. I think I have hunted it down twice myself :-)

Regards,
Simon