Hello, I'm currently developing a bootloader for a MPC8548 based board. This board has got three PCI interfaces (PCI1, PCI2 and PCIe). At the PCIe interface the MPC8548 appears as PCI-Bridge (at bus 0 device 0), at the PCI1/2 interfaces the MPC8548 appears as normal devices (bus 0 device 0).
And now I'm a little bit unshure about how Linux expects the PCI bus mapping. I see two ways: A) -------- MPC8548: PCI1 PCI2 PCIe | | | | | 3 | | bridge 0 2 4 -------- | | | extern: ------- ------ ------ | | | | | | | dev | dev dev dev... dev dev ... 0 bridge 1 | --------- | | | dev dev dev... Since I have to create Type 0 Config Read/Writes to access the first bus of an interface, my PciConfigRead/Write functions would have to convert the bus no. from 0->0 2->0 3->0 (for the example). And PCIe bridge's primary bus no. has to be set to 0. or B) -------- MPC8548: PCI1 PCI2 PCIe | | | | | 0 | | bridge 0 0 1 -------- | | | extern: ------- ------ ------ | | | | | | | dev | dev dev dev... dev dev ... 0 bridge 1 | --------- | | | dev dev dev... Every bus is mapped independently. And PciConfigRead/Write functions convert the bus no. so that upper layers (and user) see a bus mapping similar to A). Maybe someone knows how U-Boot or Linux would map the interfaces? Thank you for your Help. Ralf Best Regards/Mit freundlichen Gruessen Ralf Trübenbach, Software Design MEN Mikro Elektronik GmbH Neuwieder Straße 5-7 90411 Nuremberg, Germany Phone +49-911-99 33 5-0 Fax +49-911-99 33 5-910 E-Mail [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> www.men.de <http://www.men.de/> ---------------------------------------------------------------------- MEN Mikro Elektronik GmbH - Geschäftsführer Manfred Schmitz, Udo Fuchs - Handelsregister Nürnberg HRB 5540 - UST-ID-Nr./VAT DE 133 528 744 - Umsatzsteuer-Nr./Turnover Tax No 238/159/58551 - WEEE-Reg.-Nr. DE 49081198 - Deutsche Bank AG Kto. Nr. 0390 211, BLZ 760 700 12 - HypoVereinsbank Kto. Nr. 1560 224 300, BLZ 760 200 70 _______________________________________________ Linuxppc-embedded mailing list Linuxppc-embedded@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-embedded