Re: Fwd: Kexec support for PS3 (ppc64)

From: Piet Delaney <pdelaney@bluelane.com>
To: Geoff Levand <geoffrey.levand@am.sony.com>
Cc: Rajasekaran P <rajasekaran83@gmail.com>,
	kexec@lists.infradead.org, piet@bluelane.com
Subject: Re: Fwd: Kexec support for PS3 (ppc64)
Date: Tue, 11 Mar 2008 19:47:06 -0800	[thread overview]
Message-ID: <47D7523A.9080102@bluelane.com> (raw)
In-Reply-To: <47D7349E.90409@am.sony.com>


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Geoff Levand wrote:
> Pete/Piet Delaney wrote:
>   
>> Geoff Levand wrote:
>> | Geoff Levand wrote:
>> |> Rajasekaran P wrote:
>> |>> Hi Geoff,
>> |>> Thanks for your information.
>> |>>
>> |>> I used latest kexec tools with 2.6.23 kernel built with ps3_defconfig.
>> |>> This kernel boots normally on PS3. But when I  add "crashkernel"
>> |>> argument, it goes on hang.
>> |>>
>> |>> # kexec --command-line="video=ps3fb:mode:166 rhgb root=/dev/ps3da3
>> |>> crashkernel=128M@32M" \
>> |>> --initrd=/boot/initrd-2.6.23.img \
>> |>> -l /boot/vmlinux-2.6.23
>> |>>
>> |>> # taskset 1 kexec \x13e
>> |>>
>> |>> Nothing happens after this. As you said earlier in your mail, I am not
>> |>> getting any PRINTK outputs from kernel on screen.
>>
>> I was wondering about bringing in the printf() code from purgatory
>> and using that to print info about what's going on in the kexec code.
>> The standalone printf() might come in handy in other places; Ex: kgdb
>> stub. If it was in a library it could also be used during kernel
>> decompression to inform on problems occurring, like checksum errors.
>>     
>
> When the first stage kernel goes down it releases all hypervisor
> resources so that whatever boots next can successful open those
> resources.  The frame buffer is one of those resources that are
> released, and after it is, there will be no more output to the
> display until the second stage image brings up its display.  It
> is not a matter of adding print statements or string formatting.
>   

Oh, I thought you experienced the same problem I had
with printk() calls in some of the kexec functions making
it no longer work. I was considering changing my KEXEC_DEBUG()
macros to using printf() instead of printk() and importing
the purgatory printf() code.
> -Geoff
>
>   


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