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

[Bin Meng <bmeng.cn@gmail.com>]

Hi Simon,

On Thu, Aug 31, 2017 at 8:52 PM, Simon Glass <sjg@chromium.org> wrote:
> Hi Bin,
>
> On 31 August 2017 at 10:53, Bin Meng <bmeng.cn@gmail.com> wrote:
>> Hi Heinrich,
>>
>> On Thu, Aug 31, 2017 at 5:19 AM, Heinrich Schuchardt <xypron.glpk@gmx.de> wrote:
>>> On 08/30/2017 06:37 AM, Heinrich Schuchardt wrote:
>>>>
>>>>
>>>> On 08/30/2017 03:54 AM, Bin Meng wrote:
>>>>> Hi Heinrich,
>>>>>
>>>>> On Wed, Aug 30, 2017 at 4:26 AM, Heinrich Schuchardt <xypron.glpk@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
>>>>>
>>>>
>>>> Hello Bin,
>>>>
>>>> I have not checked block level read but used the shell commands for testing.
>>>>
>>>> Before the patch I can read the directory of the drive:
>>>>
>>>> => 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
>>>> => fat2ls ide 0:1
>>>> Unknown command 'fat2ls' - try 'help'
>>>> => fatls ide 0:1
>>>>    164768   snp.efi
>>>>         0   file1
>>>>         0   file2
>>>>
>>>>
>>>> After the patch (including HEAD) I cannot read the directory and cannot
>>>> load the file snp.efi either:
>>>>
>>>> => ide info
>>>> => fatls ide 0:1
>>>> ** Bad device ide 0 **
>>>> =>
>>>> => fatls mmc 0:1
>>>> ** Bad device mmc 0 **
>>>>
>>>>
>>>> In both cases I have loaded the same image with:
>>>>
>>>> export BUILD_ROM=y
>>>> make distclean && make qemu-x86_defconfig && make -j6
>>>>
>>>> qemu-system-x86_64 -m 1G -bios u-boot.rom -nographic \
>>>> -netdev \
>>>> user,id=eth0,tftp=tftp,net=192.168.76.0/24,dhcpstart=192.168.76.9 \
>>>> -device e1000,netdev=eth0 -machine pc-i440fx-2.8 -hda img
>>>>
>>>> Best regards
>>>>
>>>> Heinrich
>>>>
>>>
>>> Hello Bin, hello Simon,
>>>
>>> I think the bug is in functions ide_init (drivers/block/ide.c).
>>>
>>> Platform X86 implies CONFIG_BLK=y.
>>>
>>> So we should initialize ide_dev_desc[i].bdev.
>>>
>>> We don't, so blk_dread fails after finding no read operation with ENOSYS
>>> when called from part_test_dos.
>>>
>>> The following comment in include/blk.h confirms that bdev has to be filled:
>>>
>>> #if CONFIG_IS_ENABLED(BLK)
>>> /*
>>> * For now we have a few functions which take struct blk_desc as a
>>> * parameter. This field allows them to look up the associated
>>> * device. Once these functions are removed we can drop this field.
>>> */
>>> struct udevice *bdev;
>>> #else
>>>
>>> I assume that we have the same issue in in __sata_initialize
>>> (drivers/ata/sata.c) but have not tested.
>>>
>>
>> Thanks for the testing!
>>
>> Simon, are you going to fix this?
>
> I am not going to race you to it, if you are thinking of fixing it. I
> am back from travels in a few days but have a busy week ahead and the
> release is imminent :-(
>

Or maybe Heinrich, do you plan to work on a fix? If not, I will put it
on my todo list.

Regards,
Bin