[U-Boot-Users] PPC405EP CPC0_PCI init vs. update

Scott McNutt smcnutt at psyent.com
Tue Dec 6 13:45:10 CET 2005

Hi All,

In cpu/ppc4xx/start.S, the CPC0_PCI register is _initialized_,
rather than being simply _updated_. This clears bits that are
set during bootstrap from a serial eeprom. E.g. for the
PerWE/PCI_INT mux, CPC0_PCI[SPE] always gets cleared.

I'm proposing a simple change and would like some feedback ...
it's not clear to me if this will cause problems for existing

Comments welcome :-)

--- a/cpu/ppc4xx/start.S
+++ b/cpu/ppc4xx/start.S
@@ -1539,7 +1539,8 @@ ppc405ep_init:
         mtdcr   ebccfgd,r3

-       addi    r3,0,CPC0_PCI_HOST_CFG_EN
+       mfdcr   r3, CPC0_PCI
+       ori     r3,r3,CPC0_PCI_HOST_CFG_EN

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