From: Darren Stevens <darren@stevens-zone.net>
To: Michael Ellerman <mpe@ellerman.id.au>
Cc: linuxppc-dev@lists.ozlabs.org, Pat Wall <pjwall@mac.com>,
rtd@a-eon.com, aperez@alexperez.com,
Christian Zigotzky <chzigotzky@xenosoft.de>
Subject: Re: powerpc/pasemi/nemo: Fix low memory values for boot.
Date: Mon, 23 Jan 2017 19:15:25 +0000 (GMT) [thread overview]
Message-ID: <497a17344e3.4cea1c9d@auth.smtp.1and1.co.uk> (raw)
In-Reply-To: <87h94qb8u2.fsf@concordia.ellerman.id.au>
Hello Michael
On 23/01/2017, Michael Ellerman wrote:
>> Clearing the long long at addr 8 has been shown to fix this, so
>> add an initalisation to head_64.S so the system will boot.
>
> I'd really prefer it if someone could tell me why we need to clear it.
> But I assume no one knows?
The problem was found by Christian, and the fix comes courtesy of Olof
Johansson, I've not looked into it before.
> I don't want to pollute this code with NEMO workarounds if we can avoid
> it.
To be honest, so would I.
> You said the hang happens after printing the initial memory map, I'm not
> quite sure where you mean, but it sounds like that will be late enough
> that we can do the clear in pasemi platform code?
During prom_init. Where it says 'Memory layout at Init'
I took a long look today and traced the problem the 'prom_find_boot_cpu' and a
much better patch will follow.
Regards
Darren
next prev parent reply other threads:[~2017-01-23 19:16 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-20 17:46 [PATCH] powerpc/pasemi/nemo: Fix low memory values for boot Darren Stevens
2017-01-20 20:22 ` Segher Boessenkool
2017-01-23 6:15 ` Michael Ellerman
2017-01-23 19:15 ` Darren Stevens [this message]
2017-01-24 4:46 ` Michael Ellerman
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