On Mon, Oct 6, 2008 at 4:26 PM, David Brownell <david-b@xxxxxxxxxxx> wrote: >> >> Where I observed a new oddity: the boot hung right after >> >> listing the MTD partitions. Which is where the EHCI code >> >> would come up ... took that driver out of the build, and >> >> the hang went away. Clue, oh clue; where art thou? >> >> >> > >> > Well... Any chance this bit of code here helps? This infinite loop >> > shouldn't even have been here. Oh well. > > Didn't help. :( > > This code has so many infinite loops for hardware handshaking > (none with timeouts!) that it's hard to say which one might > be causing this ... if indeed one of them is indeed the cause. I put timeouts in all of the infinite loops to see which one was the culprit. Turns out it is this one in omap_start_ehc: /* Wait for TLL to be Active */ while ((cm_read_mod_reg(CORE_MOD, OMAP2430_CM_IDLEST3) & (1 << OMAP3430ES2_ST_USBTLL_SHIFT))); If I allow it fall out of the loop after 100000 tries, I get: Unhandled fault: external abort on non-linefetch (0x1028) at 0xd8062014 Internal error: : 1028 [#1] Modules linked in: CPU: 0 Not tainted (2.6.27-omap1 #1) PC is at ehci_hcd_omap_drv_probe+0x2c4/0x538 LR is at release_console_sem+0x188/0x19c pc : [<c02dae78>] lr : [<c010f060>] psr: 80000013 sp : c781fe20 ip : c781fd50 fp : c781fe44 r10: c04f8c90 r9 : 00000000 r8 : c797ae20 r7 : 00000011 r6 : c797ac00 r5 : c04f8d24 r4 : 000186a1 r3 : d8062000 r2 : 00000002 r1 : 00000001 r0 : 0000000f Flags: Nzcv IRQs on FIQs on Mode SVC_32 ISA ARM Segment kernel Control: 00c5387f Table: 80004018 DAC: 00000017 Process swapper (pid: 1, stack limit = 0xc781e2e8) Stack: (0xc781fe20 to 0xc7820000) fe20: c04f8c98 c04f8d44 c050e710 c050e710 c050af80 c001e534 c781fe54 c781fe48 fe40: c0277298 c02dabc0 c781fe74 c781fe58 c0276530 c0277284 c04f8c98 c04f8d44 fe60: c050e710 c050e710 c781fe94 c781fe78 c0276628 c027646c 00000000 c781fe9c fe80: c02765dc c050e710 c781fec4 c781fe98 c0275ba8 c02765e8 c051baa0 c7803c58 fea0: c7803c58 c04f8ce0 00000000 c050e710 c051baa0 c7b88a20 c781fed4 c781fec8 fec0: c0276378 c0275b68 c781ff04 c781fed8 c0276034 c0276364 c048fbbd c050e710 fee0: c051baa0 c05419c4 c050e710 c051baa0 00000000 00000000 c781ff2c c781ff08 ff00: c027681c c0275f98 c05419c4 c0026cf8 c051baa0 00000000 00000000 c001e534 ff20: c781ff3c c781ff30 c0277630 c0276790 c781ff5c c781ff40 c001e590 c02775c4 ff40: 000000a0 00000060 c0026fcc c0026cf8 c781ffdc c781ff60 c00ee298 c001e540 ff60: 0000015f c0533398 c781ff94 c781ff78 c0195800 c0195670 c781ff94 c7840260 ff80: c01959f8 c781ff9e c781ffc4 c781ff98 c0136844 c0195888 c781ffb4 35332618 ffa0: 00000031 00000000 00000192 c0026cf8 00000000 c0026fcc c0026cf8 00000000 ffc0: 00000000 00000000 00000000 00000000 c781fff4 c781ffe0 c0008734 c00ee254 ffe0: 00000000 00000000 00000000 c781fff8 c0111220 c00086d0 0084f950 492af4c0 Backtrace: [<c02dabb4>] (ehci_hcd_omap_drv_probe+0x0/0x538) from [<c0277298>] (platform_drv_probe+0x20/0x24) [<c0277278>] (platform_drv_probe+0x0/0x24) from [<c0276530>] (driver_probe_device+0xd0/0x17c) [<c0276460>] (driver_probe_device+0x0/0x17c) from [<c0276628>] (__driver_attach+0x4c/0x70) r7:c050e710 r6:c050e710 r5:c04f8d44 r4:c04f8c98 [<c02765dc>] (__driver_attach+0x0/0x70) from [<c0275ba8>] (bus_for_each_dev+0x4c/0x84) r7:c050e710 r6:c02765dc r5:c781fe9c r4:00000000 [<c0275b5c>] (bus_for_each_dev+0x0/0x84) from [<c0276378>] (driver_attach+0x20/0x28) r7:c7b88a20 r6:c051baa0 r5:c050e710 r4:00000000 [<c0276358>] (driver_attach+0x0/0x28) from [<c0276034>] (bus_add_driver+0xa8/0x214) [<c0275f8c>] (bus_add_driver+0x0/0x214) from [<c027681c>] (driver_register+0x98/0x120) r8:00000000 r7:00000000 r6:c051baa0 r5:c050e710 r4:c05419c4 [<c0276784>] (driver_register+0x0/0x120) from [<c0277630>] (platform_driver_register+0x78/0x94) [<c02775b8>] (platform_driver_register+0x0/0x94) from [<c001e590>] (ehci_hcd_init+0x5c/0x94) [<c001e534>] (ehci_hcd_init+0x0/0x94) from [<c00ee298>] (__exception_text_end+0x50/0x168) r5:c0026cf8 r4:c0026fcc [<c00ee248>] (__exception_text_end+0x0/0x168) from [<c0008734>] (kernel_init+0x70/0xdc) [<c00086c4>] (kernel_init+0x0/0xdc) from [<c0111220>] (do_exit+0x0/0x6c0) r5:00000000 r4:00000000 Code: e30033e9 e1510003 0a000005 e59f3248 (e5933014) ---[ end trace 596e1d827138a4cc ]--- Kernel panic - not syncing: Attempted to kill init! I'll keep digging, but I know next to nothing about the USB stack. Perhaps this info will trigger an "ah ha" for someone with more knowledge. Steve -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
