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Re: [PATCH] MIPS: add support for gzip/bzip2/lzma compressed kernel imag

To: Alexander Clouter <>
Subject: Re: [PATCH] MIPS: add support for gzip/bzip2/lzma compressed kernel images
From: Wu Zhangjin <>
Date: Mon, 10 Aug 2009 17:11:40 +0800
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On Sun, 2009-08-09 at 22:36 +0100, Alexander Clouter wrote:
> This has made my AR7[1] based Linksys WAG54Gv2 (16MB RAM and 4MB flash, 
> limited to a 768kB kernel) useful, finally...thanks!
> > 
> I got it working (LZMA kernel) however you have hardcoded a lot of bits 
> in there.  It looks to my uneducated eye most of the issues lie in that 
> and FREE_MEM_END is non-trivial on the MIPS platform currently; 
> probably because of the lack of a generic lzma/gzip/bzip2 framework to 
> be used with.
> For me I used:
>   #define FREE_MEM_START CKSEG0ADDR(0x94a00000)
>   #define FREE_MEM_END CKSEG0ADDR(0x94f00000)
> I had to replace (you probably should move this from dbg.c to dbg.h):
>   #define PORT(offset) (CKSEG1ADDR(AR7_REGS_UART0) + (4 * offset))
> The load address is awkward, but I replaced your 0x8100000 in the 
> Makefile with 0x94400000.
> Now, the big question is how to work this all out at compile time. :)

Thanks very much for your suggestion, just rewritten it and removed
almost all of the hard-coded parts(except the size of the HEAP) and a
new patch was sent out. and this new one _should_ work for the other
MIPS-based machines if not missed something else.

looking forward to your test result on AR7 with the new patch and
welcome to comment to this new E-mail thread: [PATCH -v1] MIPS: add
support for gzip/bzip2/lzma compressed kernel images

> As a side note, I would personally leave the DEBUG non-optional and 
> turned on as it all disappears at runtime anyway, but I'm no kernel 
> developer :)

ooh, in reality, I'm looking forward to the comment of Ralf and somebody
else. to my point of view, this _debug_ interface is only need to help
the developers of the other MIPS variants ensure this patch work for

Thanks & Regards,
Wu Zhangjin

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