Eric, CPU0 Link0 is connected to CPU1, and CPU0 Link1 is connected to amd8131.
Before needs_reset |= ht_setup_chain(PCI_DEV(0, 0x18, 0), 0x80); The link is 16x800, After that it change to 16x600, What's the 0x80 for? Do need to change that 0xa0, because CPU0 link1 is to amd8131. Regards YH -----邮件原件----- 发件人: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] 发送时间: 2004年3月24日 11:28 收件人: YhLu 抄送: Stefan Reinauer; [EMAIL PROTECTED] 主题: Re: 答复: ????: coherent_ht_mainboard() YhLu <[EMAIL PROTECTED]> writes: > The optimize_link make > The link CPU0 to CPU1: in CPU0 side(link0) is 16x800 and CPU1 side(link0) > is 16x800 I don't know if 1Ghz is actually supported between cpus. AMD never mentions it, at least I had not seen that it was supported when I wrote that code. So I erred on the side of caution and limited things to what is documented as supported. > but the scan_ht_chain change CPU0 side(link0) is 16x600 An 8131 does not operate reliably at over 600Mhz. Read the errata. The 8131 does advertise that it can go at 800Mhz though. > it must think it is connected to 8111 or something. I believe these cap come from ht_read_freq_cap. And they are explicitly set: Here is the general version in devices/hypertransport.c. The amdk8 versions are a little more abbreviated. static unsigned ht_read_freq_cap(device_t dev, unsigned pos) { /* Handle bugs in valid hypertransport frequency reporting */ unsigned freq_cap; freq_cap = pci_read_config16(dev, pos); freq_cap &= ~(1 << HT_FREQ_VENDOR); /* Ignore Vendor HT frequencies */ /* AMD 8131 Errata 48 */ if ((dev->vendor == PCI_VENDOR_ID_AMD) && (dev->device == PCI_DEVICE_ID_AMD_8131_PCIX)) { freq_cap &= ~(1 << HT_FREQ_800Mhz); } /* AMD 8151 Errata 23 */ if ((dev->vendor == PCI_VENDOR_ID_AMD) && (dev->device == PCI_DEVICE_ID_AMD_8151_SYSCTRL)) { freq_cap &= ~(1 << HT_FREQ_800Mhz); } /* AMD K8 Unsupported 1Ghz? */ if ((dev->vendor == PCI_VENDOR_ID_AMD) && (dev->device == 0x1100)) { freq_cap &= ~(1 << HT_FREQ_1000Mhz); } return freq_cap; } I hope this helps, Eric _______________________________________________ Linuxbios mailing list [EMAIL PROTECTED] http://www.clustermatic.org/mailman/listinfo/linuxbios
