I have a customized walnut 405 gp board. While using u-boot the bridge was not set correclty. The problem was that the bridge didn't respond to requst. The problem was traced down to PCIC0_CMD[MA]=0 on the bridge. The bit is set correclty in pci_405gp_init, later it is got changed in pci_hose_scan_bus. It is not supposed to be changed, as suggested by the comment below in the code. But this comment contradict with function pci_hose_scan_bus which intentionly doesn't skip the bridge. Removing #ifndef in pci_hose_scan_bus makes the bridge work. My question is: is this a typo?
Where can I search for u-boot mailing list archive? linuxppc is very easy to serach useful information. Sorry for the newbie question.
Thanks,
Xiaoshan
/* * drivers/pci.c skips every host bridge but the 405GP since it could * be set as an Adapter. * * I (Andrew May) don't know what we should do here, but I don't want * the auto setup of a PCI device disabling what is done pci_405gp_init * as has happened before. */
void pci_405gp_setup_bridge(struct pci_controller *hose, pci_dev_t dev, struct pci_config_table *entry) { #ifdef DEBUG printf("405gp_setup_bridge\n"); #endif }
In drivers/pci.c:
int pci_hose_scan_bus(struct pci_controller *hose, int bus) { #ifndef CONFIG_405GP /* don't skip host bridge on ppc405gp */ /* Skip our host bridge */ if ( dev == PCI_BDF(hose->first_busno,0,0) ) continue; #endif