The new code in Qemu is correct, the real problem is that the code [1] is trying to negotiate an invalid working voltage with CMD41. The SD specification marks the first 15 bits as reserved (except for the 7th, that's the dual-voltage flag) meaning that compliant cards will timeout as well.
If you look closer at the source code you can see that this problem's been patched by replacing the invalid argument 0x1 with a more reasonable 0xFFFF, barely enough to work in the 2.7V range. [1] https://eecs.wsu.edu/~cs460/samples/LAB5pre/step3/sdc.c -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. 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. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1809291/+subscriptions
