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Re: Anyone can run a -current kernel?

On 2020/02/06 0:07, Martin Husemann wrote:
On Wed, Feb 05, 2020 at 10:58:52AM +0100, Martin Husemann wrote:
I have some trouble booting -current kernels on my mac68k machine - the
kernel is quite unhappy with its root file system (see PR 54935 for
what I initially thought would be file system corruption).

This is on a Centris 660AV  (68040).

FWIW: a -current amiga kernel boots fine and is happy with the filesystem.

Could something have gone wrong with the 660AV scsi dma changes? My previous
kernel was quite old, maybe I only tested with the patches but never later
with the final commited thing?

IMO, SCSI DMA code is not guilty :). Panics occur regardless of whether
SCSI DMA is enabled or not. I sent a PR for this problem:


In short:

I believe this is because DMA controller transfers data for low physical
address to pollute kernel text, before kernel halts and initializes it.
We need to halt DMA controller in Booter, not kernel. Here's binary-
patched version of Booter:

  (CAUTION: this version should not work on non-AV Macs)

  Some unorganized notes what I did for Booter:

I've never observed this kind of panics with this version of Booter.
Can you test it?


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