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

[Guenter Roeck]

On 07/16/2018 06:48 AM, Peter Maydell wrote:
> 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)

I didn't know that ;-). I found out the hard way.

Guenter