hi,now I want to use PPC440GX as PCI adapter card bridge. according to user
manual, the PLB-PCI bridge should be configured to Adapter mode. after
check some code of PCI of linux, i find the linux only support configuring
the PLB-PCI bridge into HOST mode. Is my understanding correct ? if the
normal version of linux don't support the adapter mode, could i found the
patch?
best regards and thank you.
chen
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Hi chen,
it's not easy to setup the PCI-to-PLB mapping in a generic way so that
is gets into the kernel. Also it might be too late when the adapter OS
configures the bridge. The bridge must be setup quickly after reset so
that the host OS can assign resources to the card. The bootloader of
your board might be a good place to setup of the adapter stuff. At least
number and sizes of the needed address spaces should be setup early.
The PLB address can be setup or modified later (e.g. from the target OS).
hi,now I want to use PPC440GX as PCI adapter card bridge. according to user
manual, the PLB-PCI bridge should be configured to Adapter mode. after
check some code of PCI of linux, i find the linux only support configuring
the PLB-PCI bridge into HOST mode. Is my understanding correct ? if the
normal version of linux don't support the adapter mode, could i found the
patch?
Probably not.
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
From: Matthias Fuchs <redacted>
To: hilichen2000@msn.com
CC: linuxppc-embedded@ozlabs.org
Subject: Re: could linux support to configure the PLB-PCI bridge of PPC440
into adapter mode
Date: Mon, 19 Jun 2006 16:11:54 +0200
Hi chen,
it's not easy to setup the PCI-to-PLB mapping in a generic way so
that is gets into the kernel. Also it might be too late when the
adapter OS configures the bridge. The bridge must be setup quickly
after reset so that the host OS can assign resources to the card.
The bootloader of your board might be a good place to setup of the
adapter stuff. At least number and sizes of the needed address
spaces should be setup early.
The PLB address can be setup or modified later (e.g. from the target
OS).
quoted
hi,now I want to use PPC440GX as PCI adapter card bridge. according
to user manual, the PLB-PCI bridge should be configured to Adapter
mode. after check some code of PCI of linux, i find the linux only
support configuring the PLB-PCI bridge into HOST mode. Is my
understanding correct ? if the normal version of linux don't
support the adapter mode, could i found the patch?
Probably not.
Matthias
_________________________________________________________________
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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