[Qemu-devel] [PATCH v1 4/5] xilinx_timer: Fix writes into TCSR register

[Edgar E. Iglesias]

From: Guenter Roeck <address@hidden>

The TCSR register has only 11 valid bits. This is now used by the
linux kernel to auto-detect endianness, and causes Linux 3.15-rc1
and later to hang when run under qemu-microblaze. Mask valid bits
before writing the register to solve the problem.

Signed-off-by: Guenter Roeck <address@hidden>
Reviewed-by: Edgar E. Iglesias <address@hidden>
Signed-off-by: Edgar E. Iglesias <address@hidden>
---
 hw/timer/xilinx_timer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/timer/xilinx_timer.c b/hw/timer/xilinx_timer.c
index 6113b97..3ff1da9 100644
--- a/hw/timer/xilinx_timer.c
+++ b/hw/timer/xilinx_timer.c
@@ -169,7 +169,7 @@ timer_write(void *opaque, hwaddr addr,
             if (value & TCSR_TINT)
                 value &= ~TCSR_TINT;
 
-            xt->regs[addr] = value;
+            xt->regs[addr] = value & 0x7ff;
             if (value & TCSR_ENT)
                 timer_enable(xt);
             break;
-- 
1.8.3.2