From: Anton Blanchard <anton@samba•org>
To: Samuel Mendoza-Jonas <sam.mj@au1•ibm.com>
Cc: linuxppc-dev@ozlabs•org
Subject: Re: [kexec-lite PATCH] trampoline: Reset primary cpu endian to big-endian
Date: Wed, 8 Jul 2015 11:56:32 +1000 [thread overview]
Message-ID: <20150708115632.725120f1@kryten> (raw)
In-Reply-To: <1436318742-13490-1-git-send-email-sam.mj@au1.ibm.com>
Hi Sam,
> Older big-endian ppc64 kernels don't include the FIXUP_ENDIAN check,
> meaning if we kexec from a little-endian kernel the target kernel will
> fail to boot.
> Returning to big-endian before we enter the target kernel ensures that
> the target kernel can boot whether or not it includes FIXUP_ENDIAN.
Thanks!
I wonder if we can do something simpler, and always enter via rfid.
Avoids the need for the endian trampoline. Something like:
mtsrr0 r4
mfmsr r5
clrrdi r5,r5,1 /* Clear MSR_LE */
mtsrr1 r5
li r5,0
rfid
Anton
next prev parent reply other threads:[~2015-07-08 1:56 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-08 1:25 [kexec-lite PATCH] trampoline: Reset primary cpu endian to big-endian Samuel Mendoza-Jonas
2015-07-08 1:56 ` Anton Blanchard [this message]
2015-07-08 3:11 ` Samuel Mendoza-Jonas
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