qemu/hw/char
Guenter Roeck 65e9f27f22 bcm2835_aux: Swap RX and TX interrupt assignments
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.

NB that this error likely arises from an erratum in the
BCM2835 datasheet where the TX and RX bits were swapped
in the AU_MU_IER_REG description (but correct for IIR):
 https://elinux.org/BCM2835_datasheet_errata#p12

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Message-id: 1529355846-25102-1-git-send-email-linux@roeck-us.net
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
[PMM: added NB about datasheet]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2018-07-16 17:18:42 +01:00
..
bcm2835_aux.c bcm2835_aux: Swap RX and TX interrupt assignments 2018-07-16 17:18:42 +01:00
cadence_uart.c maint: Fix macros with broken 'do/while(0); ' usage 2018-01-16 14:54:52 +01:00
cmsdk-apb-uart.c hw/char/cmsdk-apb-uart.c: Accept more input after character read 2018-05-04 18:05:50 +01:00
debugcon.c misc: drop old i386 dependency 2017-12-18 17:07:03 +03:00
digic-uart.c hw/digic: Add trailing '\n' to qemu_log() calls 2018-06-08 13:15:33 +01:00
escc.c hw/char: remove legacy interface escc_init() 2018-02-16 12:14:26 +11:00
etraxfs_ser.c char: add backend hotswap handler 2017-07-14 11:04:33 +02:00
exynos4210_uart.c hw/char/exynos4210_uart.c: Remove unneeded handling of NULL chardev 2018-04-26 13:57:00 +01:00
grlib_apbuart.c char: avoid chardevice direct access 2017-07-14 11:04:33 +02:00
imx_serial.c i.MX: Support serial RS-232 break properly 2018-03-23 18:26:45 +00:00
ipoctal232.c char: avoid chardevice direct access 2017-07-14 11:04:33 +02:00
lm32_juart.c char: add backend hotswap handler 2017-07-14 11:04:33 +02:00
lm32_uart.c char: add backend hotswap handler 2017-07-14 11:04:33 +02:00
Makefile.objs hw: make virtio devices configurable via default-configs/ 2018-06-01 15:14:31 +02:00
mcf_uart.c hw: Do not include "exec/address-spaces.h" if it is not necessary 2018-06-01 14:15:10 +02:00
milkymist-uart.c char: add backend hotswap handler 2017-07-14 11:04:33 +02:00
omap_uart.c chardev: move headers to include/chardev 2017-06-02 11:33:52 +04:00
parallel-isa.c hw/isa: Move parallel_hds_isa_init() to hw/char/parallel-isa.c 2018-03-12 16:12:47 +01:00
parallel.c hw/char/parallel: Convert from pdebug() macro to trace events 2018-06-29 15:04:18 +01:00
pl011.c char: add backend hotswap handler 2017-07-14 11:04:33 +02:00
sclpconsole-lm.c s390x/sclp: clean up sclp masks 2018-03-08 15:49:23 +01:00
sclpconsole.c s390x/sclp: clean up sclp masks 2018-03-08 15:49:23 +01:00
serial-isa.c serial-isa: Use MAX_ISA_SERIAL_PORTS instead of MAX_SERIAL_PORTS 2018-04-26 13:57:00 +01:00
serial-pci.c pci: Add INTERFACE_CONVENTIONAL_PCI_DEVICE to Conventional PCI devices 2017-10-15 05:54:43 +03:00
serial.c Pull request 2018-06-30 13:59:53 +01:00
sh_serial.c hw: Do not include "exec/address-spaces.h" if it is not necessary 2018-06-01 14:15:10 +02:00
spapr_vty.c spapr: Implement bug in spapr-vty device to be compatible with PowerVM 2017-11-22 15:28:37 +11:00
stm32f2xx_usart.c hw/char/stm32f2xx_usart: fix TXE/TC bit handling 2018-02-22 15:12:51 +00:00
terminal3270.c chardev: introduce qemu_chr_timeout_add_ms() 2018-01-12 13:22:02 +01:00
trace-events hw/char/parallel: Convert from pdebug() macro to trace events 2018-06-29 15:04:18 +01:00
virtio-console.c Include less of the generated modular QAPI headers 2018-03-02 13:45:50 -06:00
virtio-serial-bus.c virtio-serial: fix heap-over-flow 2018-04-09 17:35:46 +03:00
xen_console.c xen: remove other open-coded use of libxengnttab 2018-05-22 11:43:21 -07:00
xilinx_uartlite.c char: add backend hotswap handler 2017-07-14 11:04:33 +02:00