Re: Heads-up: random hangs with Linux 5.7-rc4 on PowerMac6,7 (and other minor issues)
On Sun, May 10, 2020 at 12:06:30PM +0100, Rui Salvaterra wrote:
> Hi, everyone!
>
> I'm running Debian powerpc/ppc64 on a couple of PowerPC machines
> (PowerMac6,7 and PowerMac11,2) and the GRUB installation seems to be
> working perfectly, huge kudos to everyone involved!
I suspect the PowerMac6,7 is a 32 bit machine, given what you say below.
> So, apart from the big one in $SUBJECT (Linux 5.6.11 seems fine; I'm
> running a custom kernel, let me know if you want the .config), here are
> some minor issues I noticed:
>
> Plymouth colours look wrong (only tested on the 6,7, the 11,2 is headless
> atm), probably a framebuffer endiannes issue?
>
> According to the datasheets I found (which could be wrong, of course), the
> G4 7447A should also have a thermal assist unit (TAU), but the flag isn't
> enabled for this model. Could it be an oversight? (I could probably check
> if it exists/works and whip up a kernel patch accordingly.)
>
> Also, what's happening with the HIGHMEM on PowerPC? My 6,7 has 1,5 GiB of
> RAM and the LOWMEM split is at 768 MiB, which seems extremely low, compared
> to x86 machines (I personally wasn't expecting to need HIGHMEM at all, but
> maybe the the address space is really that limited, I don't know.)
Well, extremely low is a bit of an exaggeration. On 32 bit x86, lowmem
is 896MB. This is only 128MB higher than on your machine, or 16.7% more.
Regards,
Gabriel
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