Re: could linux support to configure the PLB-PCI bridge of PPC440 into adapter mode

Hello chen,

that's how we do it on our boards (a couple of 405GP(r) based adapters).
We normally hide the top meg's of RAM so that it is not used by Linux.
We setup the PLB side of the bridge to point to this RAM so that it is
accessable from the PCI side.

Matthias

hi Matthias:
  thank for your reply.
  according to information you provide, i should set the proper 
parameter of register of PPC440GX in U-BOOT(I use u-boot as 
bootloader),such as PAE,PHCE,PISE of SDR0_XCR and BAR etc.  during the 
time of linux kernel booting, I turn off CONFIG_PCI , let linux kernel 
don't initialize the PCI bus as host bridge and set PLB address in 
kernel.  then after the linux system operated, the ppc440gx could act as 
adapter mode. does my understanding correct?   i really appreciate your 
help.

chen