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From: ben.dooks@codethink.co.uk (Ben Dooks)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 12/17] ARM: fix magic for bootloader in BE8
Date: Mon, 11 Feb 2013 19:17:33 +0000	[thread overview]
Message-ID: <511943CD.6010305@codethink.co.uk> (raw)
In-Reply-To: <alpine.LFD.2.02.1302082304410.6300@xanadu.home>

On 09/02/13 04:06, Nicolas Pitre wrote:
> On Fri, 8 Feb 2013, Ben Dooks wrote:
>
>> If the boot-loader is running little endian and the kernel is compiled
>> big endian then it will not verify the magic number of the front of the
>> kernel.
>>
>> Note, do we need to also reverse the two values after the magic, or are
>> they used later on in the kernel decompressor?
>
> Those value instances are not used by the code.  So for consistency they
> would have to be reversed, yes.  Given those are variable and determined
> by the linker, I don't know how you could manage it.

By breaking it down into parts I think...

I think this patch should be re-worked depending on the outcome of
re-doing the whole ATAG endian configuration so that these are in
the same endian-ness as we expect the ATAGs to be in.

>> Signed-off-by: Ben Dooks<ben.dooks@codethink.co.uk>
>> ---
>>   arch/arm/boot/compressed/head.S |    4 ++++
>>   1 file changed, 4 insertions(+)
>>
>> diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S
>> index 39940a7..b6c7ec8 100644
>> --- a/arch/arm/boot/compressed/head.S
>> +++ b/arch/arm/boot/compressed/head.S
>> @@ -129,7 +129,11 @@ start:
>>    THUMB(		adr	r12, BSYM(1f)	)
>>    THUMB(		bx	r12		)
>>
>> +#ifdef CONFIG_CPU_BE8_BOOT_LE
>> +		.word	0x18286f01
>> +#else
>>   		.word	0x016f2818		@ Magic numbers to help the loader
>> +#endif
>>   		.word	start			@ absolute load/run zImage address
>>   		.word	_edata			@ zImage end address
>>    THUMB(		.thumb			)
>> --
>> 1.7.10.4
>>
>>
>> _______________________________________________
>> linux-arm-kernel mailing list
>> linux-arm-kernel at lists.infradead.org
>> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
>>
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel at lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel


-- 
Ben Dooks				http://www.codethink.co.uk/
Senior Engineer				Codethink - Providing Genius

  parent reply	other threads:[~2013-02-11 19:17 UTC|newest]

Thread overview: 77+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-02-08 23:17 ARM big-endian on current kernels for linux-3.8 Ben Dooks
2013-02-08 23:17 ` [PATCH 01/17] ARM: add CPU_BE8_BOOT_LE configuration Ben Dooks
2013-02-09  4:10   ` Nicolas Pitre
2013-02-09 16:46     ` Ben Dooks
2013-02-08 23:17 ` [PATCH 02/17] ARM: set BE8 if LE in head code Ben Dooks
2013-02-09  3:33   ` Nicolas Pitre
2013-02-09 16:47     ` Ben Dooks
2013-02-09 21:38   ` Rob Herring
2013-02-09 21:56     ` Ben Dooks
2013-02-11 19:35     ` Ben Dooks
2013-02-08 23:17 ` [PATCH 03/17] ARM: fix ARCH_IXP4xx usage of ARCH_SUPPORTS_BIG_ENDIAN Ben Dooks
2013-02-08 23:17 ` [PATCH 04/17] ARM: Add ARCH_SUPPORTS_BIG_ENDIAN Ben Dooks
2013-02-09 11:55   ` Russell King - ARM Linux
2013-02-09 16:55     ` Ben Dooks
2013-02-08 23:17 ` [PATCH 05/17] ARM: fixup_pv_table bug when CPU_ENDIAN_BE8 Ben Dooks
2013-02-09  3:40   ` Nicolas Pitre
2013-02-11 19:11     ` Ben Dooks
2013-02-12 21:45       ` Nicolas Pitre
2013-02-08 23:17 ` [PATCH 06/17] ARM: fixup head for atag verification Ben Dooks
2013-02-09  3:51   ` Nicolas Pitre
2013-02-09 17:09     ` Ben Dooks
2013-02-08 23:17 ` [PATCH 07/17] ARM: twd: data endian fix Ben Dooks
2013-02-08 23:17 ` [PATCH 08/17] ARM: smp_scu: data endian fixes Ben Dooks
2013-02-08 23:17 ` [PATCH 09/17] ARM: add atag32_to_cpu() function Ben Dooks
2013-02-09  3:57   ` Nicolas Pitre
2013-02-09 12:03   ` Russell King - ARM Linux
2013-02-11 19:15     ` Ben Dooks
2013-02-11 19:30       ` Russell King - ARM Linux
2013-02-12 18:46       ` Jean-Christophe PLAGNIOL-VILLARD
2013-02-12 20:34         ` Russell King - ARM Linux
2013-02-08 23:17 ` [PATCH 10/17] ARM: update atag-to-fdt code to be endian agnostic Ben Dooks
2013-02-09  3:57   ` Nicolas Pitre
2013-02-09 12:05   ` Russell King - ARM Linux
2013-02-11 19:16     ` Ben Dooks
2013-02-12 21:53       ` Nicolas Pitre
2013-02-13 11:27         ` Ben Dooks
2013-02-14  4:43           ` Nicolas Pitre
2013-02-15 11:28             ` Ben Dooks
2013-02-08 23:17 ` [PATCH 11/17] ARM: fixup atags " Ben Dooks
2013-02-09  4:03   ` Nicolas Pitre
2013-02-09 12:06   ` Russell King - ARM Linux
2013-02-08 23:17 ` [PATCH 12/17] ARM: fix magic for bootloader in BE8 Ben Dooks
2013-02-09  4:06   ` Nicolas Pitre
2013-02-09 12:08     ` Russell King - ARM Linux
2013-02-12 18:50       ` Jean-Christophe PLAGNIOL-VILLARD
2013-02-12 18:54         ` Ben Dooks
2013-02-12 19:52           ` Jean-Christophe PLAGNIOL-VILLARD
2013-02-11 19:17     ` Ben Dooks [this message]
2013-02-12 21:57       ` Nicolas Pitre
2013-02-08 23:17 ` [PATCH 13/17] ARM: pl01x debug code endian fix Ben Dooks
2013-02-09 12:09   ` Russell King - ARM Linux
2013-02-11 19:19     ` Ben Dooks
2013-02-08 23:17 ` [PATCH 14/17] highbank: enable big-endian Ben Dooks
2013-02-09 21:33   ` Rob Herring
2013-02-09 22:00     ` Ben Dooks
2013-02-08 23:17 ` [PATCH 15/17] xgmac: fix printing of hardware version Ben Dooks
2013-02-09 12:10   ` Russell King - ARM Linux
2013-02-09 17:20     ` Ben Dooks
2013-02-09 21:35   ` Rob Herring
2013-02-08 23:17 ` [PATCH 16/17] xgmac: replace __raw with relaxed IO Ben Dooks
2013-02-09 20:59   ` Rob Herring
2013-02-09 22:03     ` Ben Dooks
2013-02-08 23:17 ` [PATCH 17/17] mvebu: support running big-endian Ben Dooks
2013-02-12 17:08 ` ARM big-endian on current kernels for linux-3.8 Thomas Petazzoni
2013-02-12 17:25   ` Ben Dooks
2013-02-12 18:49     ` Thomas Petazzoni
2013-02-12 18:54       ` Ben Dooks
2013-02-13  9:48     ` Thomas Petazzoni
2013-02-12 17:13 ` Russell King - ARM Linux
2013-02-12 17:33   ` Ben Dooks
2013-02-12 22:13     ` Nicolas Pitre
2013-02-13 11:00       ` Ben Dooks
2013-02-13 10:24     ` Matthieu CASTET
2013-02-13 11:18       ` Ben Dooks
2013-02-13 15:52         ` Catalin Marinas
2013-02-13 16:02           ` Ben Dooks
2013-02-13 16:03           ` Arnd Bergmann

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