On Mon, Jul 27, 2015 at 4:36 AM, Catalin Marinas <catalin.marinas@xxxxxxx> wrote: > 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 ;). Yes, it should still work, but you may see crashes occasionally due to link quality. > >> 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. APM X-Gene U-Boot isn't available publicly yet. Though, if this is required, we can make a public GIT which will be hosted with APM server. As of now, customer who has a board from APM will have to use MyAPM to get U-Boot source and binary. > > -- > Catalin -- Regards, Duc Dang. -- 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
