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

[Peter Maydell]

On 18 June 2018 at 22:04, Guenter Roeck <address@hidden> wrote:
> 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.

Worth mentioning in the commit message that there is an
error in the BCM2835 datasheet for the TX_INT and RX_INT
bits in the AUX_MU_IER_REG description (as per
https://elinux.org/BCM2835_datasheet_errata)

thanks
-- PMM