[Bug 1809291] Re: SD Card not working in Ubuntu 18.10 (CMD 2, 3 timeout). The device worked fine in Ubuntu 18.04 and earlier versions but not in Ubuntu 18.10

[Misa.Z]

Dear Dr. KC.Wang,

Download qemu-4.2.0-rc4 source code, change hw/sd/sd.c at line 1560 like
follows and remake

(line: 1560)

if (req.arg & ACMD41_ENQUIRY_MASK) {
/*if (FIELD_EX32(sd->ocr & req.arg, OCR, VDD_VOLTAGE_WINDOW)) {*/

BTW,  here is my micro-kernel-os for arm platform based the contents
from your books, thanks !

https://github.com/MisaZhu/micro_kernel_os

Misa.Z

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https://bugs.launchpad.net/bugs/1809291

Title:
  SD Card not working in Ubuntu 18.10 (CMD 2,3 timeout).  The device
  worked fine in Ubuntu 18.04 and earlier versions but not in Ubuntu
  18.10

Status in QEMU:
  Confirmed

Bug description:
  ARM PL181 MMC card no longer working in qemu-system-arm in Ubuntu 18.10
  The MMC driver code worked fine in Ubuntu 15.10 to 18.04.
  The command to run qemu-system-arm is

      qemu-system-arm -M versatilepb -m 256M -sd sdimage -kernel t.bin
  -serial mon:stdio

  During SDC initialization, SDC commands 2, 3, 9, 13, 7, 16 all timeout, 
  which cause subsequent read/write commands 17/24 to fail also.

  Tried both ARM versatilepb and realview-pb-a8, realview-pbx-a9 boards:
  all the same.

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