On Fri, Jul 24, 2015 at 05:05:19PM -0700, Duc Dang wrote: > On Fri, Jul 24, 2015 at 3:42 PM, Bjorn Helgaas <bhelgaas@xxxxxxxxxx> wrote: > > I regularly see faults like this on an APM X-Gene: > > > > U-Boot 2013.04-mustang_sw_1.14.14 (Dec 16 2014 - 15:59:33) > > CPU0: APM ARM 64-bit Potenza Rev B0 2400MHz PCP 2400MHz > > 32 KB ICACHE, 32 KB DCACHE > > SOC 2000MHz IOBAXI 400MHz AXI 250MHz AHB 200MHz GFC 125MHz > > ... > > Unhandled fault: synchronous external abort (0x96000010) at 0xffffff8000110034 That's generated by an external device (PCIe root complex, card etc.) and some mis-configured CPU setting. > > Internal error: : 96000010 [#1] SMP > > Modules linked in: > > CPU: 0 PID: 3723 Comm: ... 4.1.0-smp-DEV #3 > > Hardware name: APM X-Gene Mustang board (DT) > > task: ffffffc7dc1a4140 ti: ffffffc7dc118000 task.ti: ffffffc7dc118000 > > PC is at pci_generic_config_read32+0x4c/0xb8 > > LR is at pci_generic_config_read32+0x40/0xb8 > > pc : [<ffffffc00033b90c>] lr : [<ffffffc00033b900>] pstate: 600001c5 > > ... > > Call trace: > > [<ffffffc00033b90c>] pci_generic_config_read32+0x4c/0xb8 > > [<ffffffc00033bf58>] pci_user_read_config_byte+0x60/0xc4 > > [<ffffffc0003496a8>] pci_read_config+0x15c/0x238 > > [<ffffffc0002393b4>] sysfs_kf_bin_read+0x68/0xa0 > > [<ffffffc00023896c>] kernfs_fop_read+0x9c/0x1ac > > [<ffffffc0001c361c>] __vfs_read+0x44/0x128 > > [<ffffffc0001c3e28>] vfs_read+0x84/0x144 > > [<ffffffc0001c4764>] SyS_read+0x50/0xb0 > > The log shows kernel gets an exception when trying to access Mellanox > card configuration space. This is usually due to suboptimal PCIe > SerDes parameters are using in your board, which will cause bad link > quality. I would have hoped that "suboptimal" means that it still works, albeit not fully optimal ;). > The PCIe SerDes programming is done in U-Boot, so I suggest you do a > U-Boot upgrade to our latest X-Gene U-Boot release. > > In order to access latest X-Gene U-Boot release, please use APM > official support channel: > https://myapm.apm.com > > Please register an account at myapm.apm.com if you don't have one > using following link: > https://myapm.apm.com/user/register Isn't the latest U-Boot source for X-Gene publicly available anywhere? It's GPL code anyway, so it shouldn't have proprietary code to require registration, click-through agreements. -- Catalin -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
