jean-philippe francois <jp.francois@xxxxxxxxxx> writes: > Hi, > > My board does not have any Power Management IC. > Without the following patch, the bood ends with an oops. > How can I further debug this, ie trace through the assembly > in arch/arm/mach-omap2/sleep34xx.S ? The assembly code that is faulting has nothing to do with interaction with the PMIC. Some more comments below ... > -- > Patch needed to boot to userspace : > > Index: linux-3.4.3/arch/arm/mach-omap2/pm34xx.c > =================================================================== > --- linux-3.4.3.orig/arch/arm/mach-omap2/pm34xx.c 2012-06-17 > 20:21:44.000000000 +0200 > +++ linux-3.4.3/arch/arm/mach-omap2/pm34xx.c 2012-06-22 16:26:38.000000000 +0200 > @@ -403,7 +403,7 @@ > trace_power_start(POWER_CSTATE, 1, smp_processor_id()); > trace_cpu_idle(1, smp_processor_id()); > > - omap_sram_idle(); > + // omap_sram_idle(); FYI... you can get the same effect without patching the kernel by adding 'nohlt' to the kernel command line. That avoids entering the idle loop alltogether. > trace_power_end(smp_processor_id()); > trace_cpu_idle(PWR_EVENT_EXIT, smp_processor_id()); > > -- > Bootlog without patch : > Booting Linux on physical CPU 0 > Linux version 3.4.3 (cynove@jp) (gcc version 4.3.2 (Sourcery G++ Lite > 2008q3-41) ) #2 PREEMPT Fri Jun 22 16:33:06 CEST 2012 > CPU: ARMv7 Processor [413fc082] revision 2 (ARMv7), cr=10c53c7d > CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache > Machine: Cynove CYDM3730 > Reserving 4194304 bytes SDRAM for VRAM > Memory policy: ECC disabled, Data cache writeback > OMAP3630 ES1.2 (l2cache iva sgx neon isp 192mhz_clk ) > Clocking rate (Crystal/Core/MPU): 19.2/400/832 MHz > Built 1 zonelists in Zone order, mobility grouping on. Total pages: 45056 > Kernel command line: console=ttyO2,115200n8 rdinit=/sbin/init > initrd=0x83000000,1536k > mtdparts=omap2-nand.0:1024k(bootloaders),3072k(linux),1536k(ramfs),-(usr) > ubi.mtd=3,2048 mem=55M@0x80000000 mem=128M@0x88000000 > PID hash table entries: 1024 (order: 0, 4096 bytes) > Dentry cache hash table entries: 32768 (order: 5, 131072 bytes) > Inode-cache hash table entries: 16384 (order: 4, 65536 bytes) > Memory: 55MB 123MB = 178MB total > Memory: 174688k/174688k available, 12704k reserved, 0K highmem > Virtual kernel memory layout: > vector : 0xffff0000 - 0xffff1000 ( 4 kB) > fixmap : 0xfff00000 - 0xfffe0000 ( 896 kB) > vmalloc : 0xd0800000 - 0xff000000 ( 744 MB) > lowmem : 0xc0000000 - 0xd0000000 ( 256 MB) > modules : 0xbf000000 - 0xc0000000 ( 16 MB) > .text : 0xc0008000 - 0xc03c5080 (3829 kB) > .init : 0xc03c6000 - 0xc03ef000 ( 164 kB) > .data : 0xc03f0000 - 0xc042b6c8 ( 238 kB) > .bss : 0xc042b6ec - 0xc043bdc8 ( 66 kB) > NR_IRQS:440 > IRQ: Found an INTC at 0xfa200000 (revision 4.0) with 96 interrupts > Total of 96 interrupts on 1 active controller > OMAP clockevent source: GPTIMER1 at 32768 Hz > sched_clock: 32 bits at 32kHz, resolution 30517ns, wraps every 131071999ms > Console: colour dummy device 80x30 > Calibrating delay loop... 831.32 BogoMIPS (lpj=3246080) > pid_max: default: 32768 minimum: 301 > Mount-cache hash table entries: 512 > CPU: Testing write buffer coherency: ok > Setting up static identity map for 0x802ad4b0 - 0x802ad508 > devtmpfs: initialized > dummy: > NET: Registered protocol family 16 > GPMC revision 5.0 > gpiochip_add: registered GPIOs 0 to 31 on device: gpio > OMAP GPIO hardware version 2.5 > gpiochip_add: registered GPIOs 32 to 63 on device: gpio > gpiochip_add: registered GPIOs 64 to 95 on device: gpio > gpiochip_add: registered GPIOs 96 to 127 on device: gpio > gpiochip_add: registered GPIOs 128 to 159 on device: gpio > gpiochip_add: registered GPIOs 160 to 191 on device: gpio > omap_mux_init: Add partition: #1: core, flags: 0 > GPMC CS4: cs_on : 2 ticks, 10 ns (was 1 ticks) 10 ns > GPMC CS4: cs_rd_off : 12 ticks, 60 ns (was 16 ticks) 60 ns > GPMC CS4: cs_wr_off : 12 ticks, 60 ns (was 16 ticks) 60 ns > GPMC CS4: adv_on : 0 ticks, 0 ns (was 1 ticks) 0 ns > GPMC CS4: adv_rd_off: 0 ticks, 0 ns (was 2 ticks) 0 ns > GPMC CS4: adv_wr_off: 0 ticks, 0 ns (was 2 ticks) 0 ns > GPMC CS4: oe_on : 2 ticks, 10 ns (was 3 ticks) 10 ns > GPMC CS4: oe_off : 12 ticks, 60 ns (was 16 ticks) 60 ns > GPMC CS4: we_on : 2 ticks, 10 ns (was 3 ticks) 10 ns > GPMC CS4: we_off : 12 ticks, 60 ns (was 16 ticks) 60 ns > GPMC CS4: rd_cycle : 14 ticks, 70 ns (was 17 ticks) 70 ns > GPMC CS4: wr_cycle : 14 ticks, 70 ns (was 17 ticks) 70 ns > GPMC CS4: access : 12 ticks, 60 ns (was 15 ticks) 60 ns > GPMC CS4: page_burst_access: 0 ticks, 0 ns (was 1 ticks) 0 ns > GPMC CS4: wr_data_mux_bus: 0 ticks, 0 ns (was 3 ticks) 0 ns > GPMC CS4: wr_access : 2 ticks, 10 ns (was 15 ticks) 10 ns > OMAP DMA hardware revision 5.0 > bio: create slab <bio-0> at 0 > SCSI subsystem initialized > omap2_mcspi omap2_mcspi.1: master is unqueued, this is deprecated > omap2_mcspi omap2_mcspi.2: master is unqueued, this is deprecated > omap2_mcspi omap2_mcspi.3: master is unqueued, this is deprecated > omap2_mcspi omap2_mcspi.4: master is unqueued, this is deprecated > omap_i2c omap_i2c.1: bus 1 rev1.4.0 at 100 kHz > Linux media interface: v0.10 > Linux video capture interface: v2.00 > omap-iommu omap-iommu.0: isp registered > Switching to clocksource 32k_counter > NET: Registered protocol family 2 > IP route cache hash table entries: 2048 (order: 1, 8192 bytes) > TCP established hash table entries: 8192 (order: 4, 65536 bytes) > TCP bind hash table entries: 8192 (order: 3, 32768 bytes) > TCP: Hash tables configured (established 8192 bind 8192) > TCP: reno registered > UDP hash table entries: 256 (order: 0, 4096 bytes) > UDP-Lite hash table entries: 256 (order: 0, 4096 bytes) > NET: Registered protocol family 1 > Trying to unpack rootfs image as initramfs... > Freeing initrd memory: 1536K > msgmni has been set to 344 > io scheduler noop registered > io scheduler deadline registered > io scheduler cfq registered (default) > OMAP DSS rev 2.0 > omapdss_venc supply vdda_dac not found, using dummy regulator > omap_uart.0: ttyO0 at MMIO 0x4806a000 (irq = 72) is a OMAP UART0 > omap_uart.1: ttyO1 at MMIO 0x4806c000 (irq = 73) is a OMAP UART1 > omap_uart.2: ttyO2 at MMIO 0x49020000 (irq = 74) is a OMAP UART2 > console [ttyO2] enabled > omap_uart.3: ttyO3 at MMIO 0x49042000 (irq = 80) is a OMAP UART3 > brd: module loaded > loop: module loaded > ONFI param page 0 valid > ONFI flash detected > NAND device: Manufacturer ID: 0x2c, Chip ID: 0xac (Micron omap2-nand.0) > NAND bus width 8 instead 16 bit > No NAND device found > NAND device: Manufacturer ID: 0x2c, Chip ID: 0xac (Micron NAND 512MiB > 1,8V 8-bit) > 4 cmdlinepart partitions found on MTD device omap2-nand.0 > Creating 4 MTD partitions on "omap2-nand.0": > 0x000000000000-0x000000100000 : "bootloaders" > 0x000000100000-0x000000400000 : "linux" > 0x000000400000-0x000000580000 : "ramfs" > 0x000000580000-0x000020000000 : "usram" > UBI: attaching mtd3 to ubi0 > UBI: physical eraseblock size: 131072 bytes (128 KiB) > UBI: logical eraseblock size: 126976 bytes > UBI: smallest flash I/O unit: 2048 > UBI: sub-page size: 512 > UBI: VID header offset: 2048 (aligned 2048) > UBI: data offset: 4096 > UBI: max. sequence number: 369 > UBI: attached mtd3 to ubi0 > UBI: MTD device name: "usr" > UBI: MTD device size: 506 MiB > UBI: number of good PEBs: 4029 > UBI: number of bad PEBs: 23 > UBI: number of corrupted PEBs: 0 > UBI: max. allowed volumes: 128 > UBI: wear-leveling threshold: 4096 > UBI: number of internal volumes: 1 > UBI: number of user volumes: 1 > UBI: available PEBs: 0 > UBI: total number of reserved PEBs: 4029 > UBI: number of PEBs reserved for bad PEB handling: 40 > UBI: max/mean erase counter: 1/0 > UBI: image sequence number: 809116472 > UBI: background thread "ubi_bgt0d" started, PID 372 > mousedev: PS/2 mouse device common for all mice > i2c /dev entries driver > omap_wdt: OMAP Watchdog Timer Rev 0x31: initial timeout 60 sec > mpu.0 supply vcc not found, using dummy regulator > omap_cpufreq_init: physical regulator not present for MPU > omap_hsmmc.0 supply vmmc not found, using dummy regulator > omap_hsmmc.0 supply vmmc_aux not found, using dummy regulator > omap_hsmmc omap_hsmmc.0: could not set regulator OCR (-22) > ------------[ cut here ]------------ > WARNING: at drivers/regulator/core.c:1554 _regulator_disable+0x30/0x10c() > unbalanced disables for dummy This looks like a bug in the MMC driver when dummy regulator is used, but is not related to the idle bug below. > Modules linked in: > [<c0012fd8>] (unwind_backtrace+0x0/0x128) from [<c002cf24>] > (warn_slowpath_common+0x4c/0x64) > [<c002cf24>] (warn_slowpath_common+0x4c/0x64) from [<c002cfbc>] > (warn_slowpath_fmt+0x2c/0x3c) > [<c002cfbc>] (warn_slowpath_fmt+0x2c/0x3c) from [<c0183080>] > (_regulator_disable+0x30/0x10c) > [<c0183080>] (_regulator_disable+0x30/0x10c) from [<c0183178>] > (regulator_disable+0x1c/0x48) > [<c0183178>] (regulator_disable+0x1c/0x48) from [<c021d64c>] > (omap_hsmmc_set_power+0xc0/0x11c) > [<c021d64c>] (omap_hsmmc_set_power+0xc0/0x11c) from [<c021d564>] > (omap_hsmmc_reg_get+0x174/0x19c) > [<c021d564>] (omap_hsmmc_reg_get+0x174/0x19c) from [<c02aa720>] > (omap_hsmmc_probe+0x408/0x6a0) > [<c02aa720>] (omap_hsmmc_probe+0x408/0x6a0) from [<c01a89a8>] > (platform_drv_probe+0x18/0x1c) > [<c01a89a8>] (platform_drv_probe+0x18/0x1c) from [<c01a77f0>] > (really_probe+0xdc/0x254) > [<c01a77f0>] (really_probe+0xdc/0x254) from [<c01a79f0>] > (driver_probe_device+0x88/0xb0) > [<c01a79f0>] (driver_probe_device+0x88/0xb0) from [<c01a7a78>] > (__driver_attach+0x60/0x84) > [<c01a7a78>] (__driver_attach+0x60/0x84) from [<c01a5f14>] > (bus_for_each_dev+0x44/0x74) > [<c01a5f14>] (bus_for_each_dev+0x44/0x74) from [<c01a671c>] > (bus_add_driver+0xc0/0x1bc) > [<c01a671c>] (bus_add_driver+0xc0/0x1bc) from [<c01a7ef0>] > (driver_register+0xa0/0xd4) > [<c01a7ef0>] (driver_register+0xa0/0xd4) from [<c00086fc>] > (do_one_initcall+0x34/0xf8) > [<c00086fc>] (do_one_initcall+0x34/0xf8) from [<c03c62e0>] > (do_initcall_level+0x60/0x98) > [<c03c62e0>] (do_initcall_level+0x60/0x98) from [<c03c632c>] > (do_initcalls+0x14/0x20) > [<c03c632c>] (do_initcalls+0x14/0x20) from [<c03c6430>] (kernel_init+0x4c/0xe0) > [<c03c6430>] (kernel_init+0x4c/0xe0) from [<c000f044>] > (kernel_thread_exit+0x0/0x8) > ---[ end trace a05bda6605792137 ]--- > omap_hsmmc omap_hsmmc.0: could not set regulator OCR (-22) > TCP: cubic registered > NET: Registered protocol family 17 > NET: Registered protocol family 15 > Registering the dns_resolver key type > VFP support v0.3: implementor 41 architecture 3 part 30 variant c rev 3 > omap_vc_init_channel: No PMIC info for vdd_core > omap_vp_init: No PMIC info for vdd_core > omap_vc_init_channel: No PMIC info for vdd_mpu_iva > omap_vp_init: No PMIC info for vdd_mpu_iva > omap_vc_pre_scale: Insufficient pmic info to scale the vdd_mpu_iva > omap_vc_pre_scale: Insufficient pmic info to scale the vdd_core This all looks normal when no PMIC is registered. The voltage layer is basically disabling itself because it can't do anything without PMIC info. That's correct. > clock: disabling unused clocks to save power > Unable to handle kernel NULL pointer dereference at virtual address 00000000 > pgd = c0004000 > [00000000] *pgd=00000000 > Internal error: Oops: 80000005 [#1] PREEMPT ARM > Modules linked in: > CPU: 0 Tainted: G W (3.4.3 #2) > PC is at 0x0 > LR is at omap34xx_do_sram_idle+0x8/0x10 This is a branch to 0x0, probably in omap34xx_cpu_suspend (in sleep34xx.S) which was just called by omap34xx_do_sram_idle. My first guess would be that the omap3_do_wfi_sram address is zero. Can you dump the value in omap_push_sram_idle()? If that looks good, do you have a debugger setup so you can single step into omap34xx_cpu_suspend() to find out where this is failing? If not, if you can send me a kernel binary (preferably with CONFIG_DEBUG_INFO=y enabled) and a corresponding crash dump for that kernel, I should be able to tell where the branch to zero is happening and maybe get a better idea. Kevin > pc : [<00000000>] lr : [<c001d2bc>] psr: 600000d3 > sp : c03f1f74 ip : cf463a90 fp : 00000000 > r10: 00000000 r9 : 413fc082 r8 : 80004059 > r7 : 00000001 r6 : 00000000 r5 : 00000000 r4 : c042c20c > r3 : 00003430 r2 : 00000010 r1 : c03fc108 r0 : 00000000 > Flags: nZCv IRQs off FIQs off Mode SVC_32 ISA ARM Segment kernel > Control: 10c5387d Table: 80004019 DAC: 00000015 > Process swapper (pid: 0, stack limit = 0xc03f02e8) > Stack: (0xc03f1f74 to 0xc03f2000) > 1f60: 00000001 00000000 00000000 > 1f80: 00000001 80004059 413fc082 00000000 00000000 c001d2bc 00000001 c001d434 > 1fa0: c03f0000 c042b780 c03e6560 c03faff4 80004059 c001d568 c03f0000 c000f154 > 1fc0: c03f0000 c000f6ac c03f8134 c03c68b4 ffffffff ffffffff c03c6574 00000000 > 1fe0: 00000000 c03e6564 00000000 10c53c7d c03f808c 8000803c 00000000 00000000 > [<c001d2bc>] (omap34xx_do_sram_idle+0x8/0x10) from [<00000000>] ( (null)) > Code: bad PC value > ---[ end trace a05bda6605792139 ]--- > Kernel panic - not syncing: Attempted to kill the idle task! > -- > 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 -- 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
