Rune Torgersen wrote: > Our problem is that we can only access the first 128MB of the > prefetchable area. > an access to 0x87ff_ffff works (after ioremap), while an access to > 0x8800_0000 causes an bus error. > > trying to access 0x87FFFFFC -> 0x00000000 > trying to access 0x88000000 ->Machine check in kernel mode. > Caused by (from SRR1=49030): Transfer error ack signal > > It is like the prefetch area is not set up correctly for ioremap. > > The PCI registers are set up correctly in u-boot, and we can access the > whole prefetch area in u-boot without any problems.
Are you using cuImage, or a regular uImage with a device-tree-aware u-boot? If the former, try commenting out the call to fixup_pci() in arch/powerpc/boot/cuboot-pq2.c and let me know if that changes anything. Otherwise, are you sure the kernel didn't move BARs around such that there's no longer a PCI device mapped at 0x88000000 (or that the device that is there has been disabled)? Can you show the contents of the following big endian registers: TESCR1 (0x10040), TESCR2 (0x10044), PCIBRx (0x101ac, 0x101b0), and PCIMSKx (0x101c4, 0x101c8) and the following little endian registers: POTARx (0x10800, 0x10818, 0x10830), POBARx (0x10808, 0x10820, 0x10838), POCMRx (0x10810, 0x10828, 0x10840), POESR (0x10084), PCI_EACR (0x10890), and PCI_ECCR (0x108a0) after the machine check happens? -Scott _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
