> -----Original Message----- > From: [email protected] [mailto:linux-omap- > [email protected]] On Behalf Of Felipe Balbi > Sent: Wednesday, January 05, 2011 7:38 PM > To: Russell King; Tony Lindgren > Cc: Linux ARM Kernel Mailing List; Linux OMAP Mailing List > Subject: OMAP4 panda gets stuck during reboot > > Hi, > > It seems like there's a bug on flush_pmd_entry() for multicore ARM > CPUs. > > I'm testing 2.6.37 with pandaboard and when running "reboot" it gets > stuck on: > > asm("mcr p15, 0, %0, c7, c10, 1 @ flush_pmd" > : : "r" (pmd) : "cc"); > > I added a few printk()s around the code to find the specific spot > where > the reset sequence was getting stuck and here's the output: > > [ 112.497253] ===> kernel_restart (line 312) > [ 112.501525] ===> kernel_restart_prepare (line 294) > [ 112.506561] ===> device_shutdown (line 1661) > [ 112.511871] ===> device_shutdown (line 1692) > [ 112.516387] ===> sysdev_shutdown (line 323) > [ 112.520782] ===> sysdev_shutdown (line 349) > [ 112.525146] ===> kernel_restart_prepare (line 299) > [ 112.530181] Restarting system. > [ 112.533386] ===> machine_restart (line 254) > [ 112.537750] ===> machine_shutdown (line 232) > [ 112.542236] ===> machine_shutdown (line 236) > [ 112.546722] ===> arm_machine_restart (line 96) > [ 112.551391] ===> setup_mm_for_reboot (line 1059) > [ 112.556213] ===> setup_mm_for_reboot (line 1066) > [ 112.561035] ===> setup_mm_for_reboot (line 1071) > [ 112.565856] ===> flush_pmd_entry (line 522) > > What could it be ? Any more debugging I could do to help ? > This is known and seems to OMAP specific issue. Test patch and relevant thread is here.
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