[U-Boot] PowerPC chipselects

[U-Boot] PowerPC chipselects

[julianosam]

Hi. Im new with embedded systems. I have a board which has a powerpc 8313
processor on it, running a linux kernel + uboot.

In the PowerPC Local Bus, there is a chipset connected to the CS02 powerpc
pin. The problem is, i don't know how to map the chipset memory into powerpc
main memory. What config files I have to change?

I already have a device driver for the chipset, but i dont know what memory
address i should io_remap() to talk to it!
The only information I have about the chipset is that it is connected to the
CS02 pin, and the memory size needed is 0x8000 (32k).


Thanks
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[U-Boot] PowerPC chipselects

[Scott Wood]

On Sat, Nov 21, 2009 at 11:23:42AM -0800, julianosam wrote:
> 
> Hi. Im new with embedded systems. I have a board which has a powerpc 8313
> processor on it, running a linux kernel + uboot.
> 
> In the PowerPC Local Bus, there is a chipset connected to the CS02 powerpc
> pin. The problem is, i don't know how to map the chipset memory into powerpc
> main memory. What config files I have to change?

In the board config file, define CONFIG_SYS_BR2_PRELIM and
CONFIG_SYS_OR2_PRELIM according to the values that you want programmed into
the local bus controller (see the local bus section of the 8313 reference
manual for details).

-Scott