[Qemu-devel] [PULL 3/6] lsi: ignore write accesses to CTEST0 registers

[Paolo Bonzini <pbonzini@redhat.com>]

From: Hervé Poussineau <hpoussin@reactos.org>

53C895A datasheet says that this register is read/write, and that the value
returned on read access is dependant of DMA FIFO state. However, nothing is
said for written value.

53C810A datasheet gives more insight about this register:
"This was a general purpose read/write register in previous SYM53C8XX
family chips. Although it is still a read/write register, Symbios reserves
the right to use these bits for future 53C8XX family enhancements."

This prevents going to the default case, which prints an error message.

Signed-off-by: Hervé Poussineau <hpoussin@reactos.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 hw/scsi/lsi53c895a.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/hw/scsi/lsi53c895a.c b/hw/scsi/lsi53c895a.c
index 4314efe..89d934b 100644
--- a/hw/scsi/lsi53c895a.c
+++ b/hw/scsi/lsi53c895a.c
@@ -1743,6 +1743,9 @@ static void lsi_reg_writeb(LSIState *s, int offset, uint8_t val)
     case 0x17: /* MBOX1 */
         s->mbox1 = val;
         break;
+    case 0x18: /* CTEST0 */
+        /* nothing to do */
+        break;
     case 0x1a: /* CTEST2 */
 	s->ctest2 = val & LSI_CTEST2_PCICIE;
 	break;
-- 
1.8.3.1