From mboxrd@z Thu Jan  1 00:00:00 1970
From: Heinrich Schuchardt <xypron.glpk@gmx.de>
Date: Tue, 29 Aug 2017 22:26:09 +0200
Subject: [U-Boot] ** Can't read Driver Desriptor Block **
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To: u-boot@lists.denx.de

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.

Best regards

Heinrich