[U-Boot-Users] U-boot and kernel

Stefan Roese sr at denx.de
Sat Oct 7 19:51:02 CEST 2006


On Saturday 07 October 2006 18:13, Gerald Jackson wrote:
> Does anyone know what U-boot tells the kernel about memory?

Yes. I assume you are asking about 4xx PPC's right?

Until recently the only interface to communicate information between U-Boot & 
Linux on PPC platforms was the bd_info structure. And this structure included 
the memory size too.

For other cpu platforms there are other mechanisms to communicate this kind of 
information but right now this is (still) the way to go for 4xx PPC's.

> The kernel has the same memory bug that I fix in u-boot and I don't know
> if u-boot is telling it anything.

Are you talking about the bug in the DIMM module setup of the Ocotea board? 
There is definitely not the same bug in the linux kernel, since the kernel 
doesn't setup the memory controller (again).

Just a thought: Are you having problems with Linux and bigger memory modules? 
IIRC you have to configure your kernel differently when you are using more 
than 768MBytes (setup highmem...).

Best regards,

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