Trivial fix for the issue reported by Guenter here:
https://lore.kernel.org/qemu-devel/5b2dc427-f0db-4332-a997-fe0c82415...@roeck-us.net/

- Return dummy byte when no card is connected
- Add a test

Philippe Mathieu-Daudé (2):
  hw/sd/ssi-sd: Return noise (dummy byte) when no card connected
  tests/functional: Test SPI-SD adapter without SD card connected

 hw/sd/ssi-sd.c                            |  4 ++++
 tests/functional/test_riscv64_sifive_u.py | 22 +++++++++++++++++-----
 2 files changed, 21 insertions(+), 5 deletions(-)

-- 
2.49.0


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