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 <li...@roeck-us.net>
---
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
