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This is wrong, we shouldn't return any particular packet response, but the noise shifted on the MISO line. Return the dummy byte, otherwise we get: qemu-system-riscv64: ../hw/sd/ssi-sd.c:160: ssi_sd_transfer: Assertion `s= ->arglen > 0' failed. Reported-by: Guenter Roeck Fixes: 775616c3ae8 ("Partial SD card SPI mode support") Signed-off-by: Philippe Mathieu-Daud=C3=A9 Tested-by: Guenter Roeck Reviewed-by: Alex Benn=C3=A9e Reviewed-by: Gustavo Romero --- hw/sd/ssi-sd.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/hw/sd/ssi-sd.c b/hw/sd/ssi-sd.c index 594dead19ee..3aacbd03871 100644 --- a/hw/sd/ssi-sd.c +++ b/hw/sd/ssi-sd.c @@ -89,6 +89,10 @@ static uint32_t ssi_sd_transfer(SSIPeripheral *dev, uint= 32_t val) SDRequest request; uint8_t longresp[5]; =20 + if (!sdbus_get_inserted(&s->sdbus)) { + return SSI_DUMMY; + } + /* * Special case: allow CMD12 (STOP TRANSMISSION) while reading data. * --=20 2.49.0