Peter Maydell <peter.maydell@xxxxxxxxxx> writes: > On 6 May 2013 06:11, Rusty Russell <rusty@xxxxxxxxxxxxxxx> wrote: >> Peter Maydell <peter.maydell@xxxxxxxxxx> writes: >>> To be actually useful we need to also specify something in >>> the device tree to say "here is where you will find your >>> emergency output and what it is". >> >> Hmm, I'm not sure that's true. It looks like it needs: >> >> 1) An enhancment to the vdev->set_config callback to pass through (at >> least) an offset, probably offset and length. >> >> 2) An emerg_write() function ptr which can be called at any time, set by >> virtio_console.c's class_init: > > That all looks like sensible QEMU implementation possibilities > but it seems to be a bit of a non-sequitur from "how do we > tell the kernel to actually use this?" You enable the feature in the virtio console device, and a kernel compiled with EARLY_PRINTK will use it? Cheers, Rusty. _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/cucslists/listinfo/kvmarm
