On 27 Oct 2005, at 11:29, Ralf Baechle wrote:
On Thu, Oct 27, 2005 at 10:02:40AM +0100, Chris Boot wrote:Due to the puny amounts of RAM (2MB) on my board, I'm going to have to use XIP so that RAM isn't being taken up by kernel code. I was looking around for MIPS XIP patches and all I could find was in the linux-vr tree which seems, well, dead.The linux-vr tree is kept online for people to dig out the goodies whichmay be left in there :-)Does anyone know of any more recent patches or should I undertake the work of porting the patch to a more recent 2.4 kernel?I guess you'll have to do that. The alternative would be to port the 2.6 ARM XIP_KERNEL implementation. Ralf
Looks like I'm getting somewhere! I still don't have a JTAG or any way to test the kernels I've built, but readelf provides good looking results and my flat binary image looks like it will do the right thing.
Basically what I've done is ported over the XIP code from the linux- vr tree but renamed config symbols to be more similar to the ARM XIP code in 2.6, so then I can port the 2.6 MTD code into my 2.4 tree (if possible) that little bit more easily.
The only remaining question now is: the kernel_entry symbol seems to be placed pretty randomly in my kernel image, and the way I'm finding it now is by getting the entry point address from readelf. Is there a way I can either move this to be at the start of the image or insert the entry point address at the start of my image? Surely I can't be expected to hand-edit an entry point address in my bootloader and flash the lot to run my kernel, can I?
Many thanks, Chris -- Chris Boot bootc@xxxxxxxxx http://www.bootc.net/
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