MPC8270 PCI Bridge Configuration Register offset 0x40 and 0x98

reedy — Fri, 22 Apr 2016 21:19:50 GMT

While making modifications to legacy software we have found writes to reserved/undocumented registers. Maybe these are from an early datasheet or errata?

Both writes are to the host PCI configuration space (bus=0, dev=0, fxn=0)

// PCI Bridge Option

0x40 = 0x00000004;

// PCI PIMOSA

0x98 = 0xC0000003;

Does anyone recognize what these register writes are doing?

Thanks,

Re: MPC8270 PCI Bridge Configuration Register offset 0x40 and 0x98

Bulat — Mon, 25 Apr 2016 11:03:48 GMT

Those registers are definitely not from the MPC8270 PCI configuration space. If your software was really written for the MPC8270, you should remove those writes.

Regards,

Bulat

topic MPC8270 PCI Bridge Configuration Register offset 0x40 and 0x98 in PowerQUICC Processors

MPC8270 PCI Bridge Configuration Register offset 0x40 and 0x98

Re: MPC8270 PCI Bridge Configuration Register offset 0x40 and 0x98