linux-kernel - Re: [PATCH v3 02/31] arm64: Kernel booting and initialisation

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Message-ID: <504E4D89.3020203@jonmasters.org>
Date:	Mon, 10 Sep 2012 16:28:57 -0400
From:	Jon Masters <jonathan@...masters.org>
To:	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
CC:	Nicolas Pitre <nico@...xnic.net>,
	Catalin Marinas <catalin.marinas@....com>,
	linux-arch@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 02/31] arm64: Kernel booting and initialisation

On 09/10/2012 01:53 AM, Jean-Christophe PLAGNIOL-VILLARD wrote:
> On 19:29 Sun 09 Sep     , Nicolas Pitre wrote:
>> On Sun, 9 Sep 2012, Jean-Christophe PLAGNIOL-VILLARD wrote:
>>
>>> On 17:26 Fri 07 Sep     , Catalin Marinas wrote:
>>>> +4. Call the kernel image
>>>> +------------------------
>>>> +
>>>> +Requirement: MANDATORY
>>>> +
>>>> +The decompressed kernel image contains a 32-byte header as follows:
>>>> +
>>>> +  u32 magic	= 0x14000008;	/* branch to stext, little-endian */
>>>> +  u32 res0	= 0;		/* reserved */
>>>> +  u64 text_offset;		/* Image load offset */
>>>> +  u64 res1	= 0;		/* reserved */
>>>> +  u64 res2	= 0;		/* reserved */
>>> we need to have a magic to known it's a arm64 kernel
>>
>> You have it: it's 0x14000008 at the beginning.
> fragile

Others have commented on the relocatable kernel non-issue. But to this 
part, also bear in mind that Catalin pointed out boot standardization 
work may change how some AArch64 systems ultimately end up booting.

Thanks,

Jon.
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