[Qemu-devel] [PATCH] bcm2835_aux: Swap RX and TX interrupt assignments

[Guenter Roeck]

RX and TX interrupt bits were reversed, resulting in an endless sequence
of serial interupts in the emulated system and the following repeated
error message when booting Linux.

serial8250: too much work for irq61

This results in a boot failure most of the time.

Qemu command line used to reproduce the problem:

        qemu-system-aarch64 -M raspi3 -m 1024 \
        -kernel arch/arm64/boot/Image \
        --append "rdinit=/sbin/init console=ttyS1,115200"
        -initrd rootfs.cpio \
        -dtb arch/arm64/boot/dts/broadcom/bcm2837-rpi-3-b.dtb \
        -nographic -monitor null -serial null -serial stdio

This is with arm64:defconfig. The root file system was generated using
buildroot.

Signed-off-by: Guenter Roeck <address@hidden>
---
 hw/char/bcm2835_aux.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/hw/char/bcm2835_aux.c b/hw/char/bcm2835_aux.c
index 370dc7e..0364596 100644
--- a/hw/char/bcm2835_aux.c
+++ b/hw/char/bcm2835_aux.c
@@ -39,8 +39,8 @@
 #define AUX_MU_BAUD_REG 0x68
 
 /* bits in IER/IIR registers */
-#define TX_INT  0x1
-#define RX_INT  0x2
+#define RX_INT  0x1
+#define TX_INT  0x2
 
 static void bcm2835_aux_update(BCM2835AuxState *s)
 {
-- 
2.7.4