The 'Transfer Block Size' field is 12-bit wide. See section '2.2.2. Block Size Register (Offset 004h)' in datasheet.
Cc: qemu-sta...@nongnu.org Cc: Igor Mitsyanko <i.mitsya...@gmail.com> Buglink: https://bugs.launchpad.net/qemu/+bug/1892960 Fixes: d7dfca0807a ("hw/sdhci: introduce standard SD host controller") Reported-by: Alexander Bulekov <alx...@bu.edu> Signed-off-by: Philippe Mathieu-Daudé <f4...@amsat.org> --- Cc: 1892...@bugs.launchpad.net --- hw/sd/sdhci.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/hw/sd/sdhci.c b/hw/sd/sdhci.c index 60f083b84c1..ecbf84e9d3f 100644 --- a/hw/sd/sdhci.c +++ b/hw/sd/sdhci.c @@ -1104,7 +1104,7 @@ sdhci_write(void *opaque, hwaddr offset, uint64_t val, unsigned size) break; case SDHC_BLKSIZE: if (!TRANSFERRING_DATA(s->prnsts)) { - MASKED_WRITE(s->blksize, mask, value); + MASKED_WRITE(s->blksize, mask, extract32(value, 0, 12)); MASKED_WRITE(s->blkcnt, mask >> 16, value >> 16); } -- 2.26.2