21 Jul
2003
21 Jul
'03
11:36 a.m.
Hello Wolfgang,
Does anybody knows something about the registers OPBA0_CR and OPBA0_PR (OPB Arbiter control and priority)? After reset its contents shows illegal bit values (if I try to interpret the value after reset based on my 405GP manual).
And which CPU model is on your board?
IBM PowerPC 405GP Rev. E (rev register ID is 0x40110145). The register descriptions of OPBA0_CR and OPBA0_PR confusing me: OPBA0_CR resides at MMIO location 0xEF60'0600 and OPBA0_PR at 0xEF60'0601. Both are described as two 32 bit registers, but only using the upper 8 bits.
I think I have to access these registers only byte wide at their locations 0xEF60'0600 and 0xEF60'0601, or both in one 16 bit access at 0xEF60'0600. Right?
Best regards, Juergen Beisert