KGDB on AM3517evm

I noticed something else when I want to invoke KDB with the Magic SysRq 'g' using echo g >/proc/sysrq-trigger I get the help menu. It seems that the "g" command is not implemented.

root@am3517-evm:~# echo g >/proc/sysrq-trigger                                 
SysRq : HELP : loglevel(0-9) reBoot Crash show-all-locks(D) terminate-all-tasks(E) memory-full-oom-kill(F) kill-all-tasks(I) thaw-filesystems(J)

saK show-memory-usage(M) nice-all-RT-tasks(N) powerOff show-registers(P) show-all-timers(Q) unRaw Sync show-task-states(T)

Unmount show-blocked-tasks(W) dump-ftrace-buffer(Z)

I included 2 screenshots, one is my kernel menuconfig where KGDB is checked and the second one is the kernel build where you can see that KDB is compiled.

Any help on how to make KGDB works will be appreciated, thanks.

Can you please post the boot log from when you pass in kgdbwait and such?  Thanks.

Hi,

here is my complete boot log, the bootargs with kgdbwait is in red and bold (kgdbwait is declared after kgdboc). There are few errors because I removed the application board from the main board.

The idea is to share ttyO2 with the console and Kgdb.

Thanks for the help.

Texas Instruments X-Loader 1.51 (Jul  5 2011 - 17:42:20)
Booting from nand . . .
Starting OS Bootloader...


U-Boot 2010.06 (Sep 19 2011 - 11:44:04)

OMAP34xx/35xx-GP ES1.0, CPU-OPP2 L3-165MHz
AM3517EVM Board + LPDDR/NAND
I2C:   ready
DRAM:  256 MiB
NAND:  HW ECC [Kernel/FS layout] selected
512 MiB
In:    serial
Out:   serial
Err:   serial
Die ID #1b4a000100000000015da39616019003
Net:   davinci_emac_initialize
Ethernet PHY: GENERIC @ 0x00
DaVinci EMAC
Hit any key to stop autoboot:  0
BOOTP broadcast 1
DHCP client bound to address 10.0.5.195
Using DaVinci EMAC device
TFTP from server 10.0.42.1; our IP address is 10.0.5.195
Filename 'uImage'.
Load address: 0x82000000
Loading: #################################################################
         #################################################################
         #################################################################
         #################################################################
         #################################################################
         #################################################################
         #################################################################
         #################################################################
         #######################################################
done
Bytes transferred = 2942448 (2ce5f0 hex)
## Booting kernel from Legacy Image at 82000000 ...
   Image Name:   Linux-2.6.37
   Image Type:   ARM Linux Kernel Image (uncompressed)
   Data Size:    2942384 Bytes = 2.8 MiB
   Load Address: 80008000
   Entry Point:  80008000
   Verifying Checksum ... OK
   Loading Kernel Image ... OK
OK

Starting kernel ...

Uncompressing Linux... done, booting the kernel.
Linux version 2.6.37 (laurent@laurent-ubuntu) (gcc version 4.3.3 (Sourcery G++ Lite 2009q1-2
03) ) #16 Tue Oct 11 10:44:27 EDT 2011
CPU: ARMv7 Processor [411fc087] revision 7 (ARMv7), cr=10c53c7f
CPU: VIPT nonaliasing data cache, VIPT nonaliasing instruction cache
Machine: OMAP3517/AM3517 EVM
Reserving 4194304 bytes SDRAM for VRAM
Memory policy: ECC disabled, Data cache writeback
AM3517 ES1.1 (l2cache iva sgx neon isp )
SRAM: Mapped pa 0x40200000 to va 0xfe400000 size: 0x10000
Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 64000
Kernel command line: console=ttyO2,115200n8 rw noinitrd root=/dev/nfs nfsroot=10.0.42.1:/home/laurent/ti-sdk-am3517-evm-05.02.00.00/targetNFS,nolock,rsize=1024,wsize=1024 ip=10.0.42.2::10.0.42.1:::eth0:off kgdboc=ttyO2,115200 kgdbwait
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: 252MB = 252MB total
Memory: 242428k/242428k available, 19716k reserved, 0K highmem
Virtual kernel memory layout:
    vector  : 0xffff0000 - 0xffff1000   (   4 kB)
    fixmap  : 0xfff00000 - 0xfffe0000   ( 896 kB)
    DMA     : 0xffc00000 - 0xffe00000   (   2 MB)
    vmalloc : 0xd0800000 - 0xf8000000   ( 632 MB)
    lowmem  : 0xc0000000 - 0xd0000000   ( 256 MB)
    modules : 0xbf000000 - 0xc0000000   (  16 MB)
      .init : 0xc0008000 - 0xc003a000   ( 200 kB)
      .text : 0xc003a000 - 0xc056f8d8   (5335 kB)
      .data : 0xc0570000 - 0xc0722fe0   (1740 kB)
NR_IRQS:375
Clocking rate (Crystal/Core/MPU): 26.0/332/600 MHz
omap_hwmod: i2c1: softreset failed (waited 10000 usec)
omap_hwmod: i2c2: softreset failed (waited 10000 usec)
omap_hwmod: i2c3: softreset failed (waited 10000 usec)
Reprogramming SDRC clock to 332000000 Hz
dpll3_m2_clk rate change failed: -22
IRQ: Found an INTC at 0xfa200000 (revision 4.0) with 96 interrupts
Total of 96 interrupts on 1 active controller
GPMC revision 5.0
Trying to install interrupt handler for IRQ368
Trying to install interrupt handler for IRQ369
Trying to install interrupt handler for IRQ370
Trying to install interrupt handler for IRQ371
Trying to install interrupt handler for IRQ372
Trying to install interrupt handler for IRQ373
Trying to install interrupt handler for IRQ374
Trying to install type control for IRQ375
Trying to set irq flags for IRQ375
OMAP clockevent source: GPTIMER1 at 32768 Hz
Console: colour dummy device 80x30
Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar
... MAX_LOCKDEP_SUBCLASSES:  8
... MAX_LOCK_DEPTH:          48
... MAX_LOCKDEP_KEYS:        8191
... CLASSHASH_SIZE:          4096
... MAX_LOCKDEP_ENTRIES:     16384
... MAX_LOCKDEP_CHAINS:      32768
... CHAINHASH_SIZE:          16384
 memory used by lock dependency info: 3951 kB
 per task-struct memory footprint: 2304 bytes
Calibrating delay loop... 597.64 BogoMIPS (lpj=2334720)
pid_max: default: 32768 minimum: 301
Security Framework initialized
Mount-cache hash table entries: 512
CPU: Testing write buffer coherency: ok
regulator: core version 0.5
regulator: dummy:
NET: Registered protocol family 16
------------[ cut here ]------------
WARNING: at arch/arm/mach-omap2/pm.c:94 _init_omap_device+0x84/0xa4()
_init_omap_device: could not find omap_hwmod for iva
Modules linked in:
[<c004a678>] (unwind_backtrace+0x0/0xec) from [<c0070cfc>] (warn_slowpath_common+0x4c/0x64)
[<c0070cfc>] (warn_slowpath_common+0x4c/0x64) from [<c0070d94>] (warn_slowpath_fmt+0x2c/0x3c
)
[<c0070d94>] (warn_slowpath_fmt+0x2c/0x3c) from [<c0051dd4>] (_init_omap_device+0x84/0xa4)
[<c0051dd4>] (_init_omap_device+0x84/0xa4) from [<c00100b8>] (omap2_common_pm_init+0x2c/0x10
c)
[<c00100b8>] (omap2_common_pm_init+0x2c/0x10c) from [<c003a3b8>] (do_one_initcall+0xc8/0x1a0
)
[<c003a3b8>] (do_one_initcall+0xc8/0x1a0) from [<c0008690>] (kernel_init+0x94/0x14c)
[<c0008690>] (kernel_init+0x94/0x14c) from [<c0045590>] (kernel_thread_exit+0x0/0x8)
---[ end trace 1b75b31a2719ed1c ]---
OMAP GPIO hardware version 2.5
OMAP GPIO hardware version 2.5
OMAP GPIO hardware version 2.5
OMAP GPIO hardware version 2.5
OMAP GPIO hardware version 2.5
OMAP GPIO hardware version 2.5
omap_mux_init: Add partition: #1: core, flags: 0
Display initialized successfully
_omap_mux_init_gpio: Multiple gpio paths (2) for gpio126
NOR: Unable to find configuration in GPMC
hw-breakpoint: debug architecture 0x4 unsupported.
OMAP DMA hardware revision 4.0
bio: create slab <bio-0> at 0
SCSI subsystem initialized
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
omap_device: omap_i2c.1: new worst case activate latency 0: 30517
omap_i2c omap_i2c.1: bus 1 rev3.12 at 400 kHz
omap_device: omap_i2c.1: new worst case deactivate latency 0: 30517
omap_i2c omap_i2c.2: bus 2 rev3.12 at 400 kHz
pca953x 2-0021: interrupt support not compiled in
omap_i2c omap_i2c.3: bus 3 rev3.12 at 400 kHz
tca6416-keypad 3-0020: tca6416_read_reg failed, reg: 1, error: -121
tca6416-keypad: probe of 3-0020 failed with error -121
pca953x 3-0021: failed reading register
pca953x: probe of 3-0021 failed with error -121
Switching to clocksource 32k_counter
musb-hdrc: version 6.0, otg (peripheral+host), debug=0
musb-hdrc musb-hdrc.0: dma type: dma-cppi41
<6>Waiting for PHY clock good...
musb-hdrc musb-hdrc.0: USB OTG mode controller at d0810000 using DMA, IRQ 71
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: 6, 360448 bytes)
TCP: Hash tables configured (established 8192 bind 8192)
TCP reno registered
UDP hash table entries: 128 (order: 1, 12288 bytes)
UDP-Lite hash table entries: 128 (order: 1, 12288 bytes)
NET: Registered protocol family 1
RPC: Registered udp transport module.
RPC: Registered tcp transport module.
RPC: Registered tcp NFSv4.1 backchannel transport module.
NetWinder Floating Point Emulator V0.97 (double precision)
omap_init_opp_table: no hwmod or odev for iva, [9] cannot add OPPs.
AM3517  Linux PSP version 04.02.00.07 (AM3517EVM)
VFS: Disk quotas dquot_6.5.2
Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
JFFS2 version 2.2. (NAND) (SUMMARY)  �© 2001-2006 Red Hat, Inc.
msgmni has been set to 473
io scheduler noop registered
io scheduler deadline registered
io scheduler cfq registered (default)
OMAP DSS rev 2.0
omapdss supply vdds_dsi not found, using dummy regulator
OMAP DISPC rev 3.0
omapdss supply vdda_dac not found, using dummy regulator
OMAP VENC rev 2
OMAP DSI rev 1.0
Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
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
brd: module loaded
loop: module loaded
mtdoops: mtd device (mtddev=name/number) must be supplied
omap2-nand driver initializing
NAND device: Manufacturer ID: 0x2c, Chip ID: 0xbc (Micron )
Creating 5 MTD partitions on "omap2-nand.0":
0x000000000000-0x000000080000 : "xloader-nand"
0x000000080000-0x000000240000 : "uboot-nand"
0x000000240000-0x000000280000 : "params-nand"
0x000000280000-0x000000780000 : "linux-nand"
0x000000780000-0x000020000000 : "jffs2-nand"
davinci_mdio davinci_mdio: davinci mdio revision 1.5
davinci_mdio davinci_mdio: detected phy mask fffffffe
davinci_mdio: probed
davinci_mdio davinci_mdio: phy[0]: device ffffffff:00, driver SMSC LAN8710/LAN8720
vcan: Virtual CAN interface driver
CAN device driver interface
TI High End CAN Controller Driver 0.7
ti_hecc ti_hecc: device registered (reg_base=d0890000, irq=24)
usbcore: registered new interface driver cdc_ether
usbcore: registered new interface driver dm9601
ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
ehci-omap.0 supply hsusb0 not found, using dummy regulator
ehci-omap ehci-omap.0: OMAP-EHCI Host Controller
ehci-omap ehci-omap.0: new USB bus registered, assigned bus number 1
ehci-omap ehci-omap.0: irq 77, io mem 0x48064800
ehci-omap ehci-omap.0: USB 2.0 started, EHCI 1.00
usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb1: Product: OMAP-EHCI Host Controller
usb usb1: Manufacturer: Linux 2.6.37 ehci_hcd
usb usb1: SerialNumber: ehci-omap.0
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 3 ports detected
Initializing USB Mass Storage driver...
usbcore: registered new interface driver usb-storage
USB Mass Storage support registered.
usbcore: registered new interface driver usbtest
g_ether gadget: using random self ethernet address
g_ether gadget: using random host ethernet address
usb0: MAC 0a:7e:85:37:2b:64
usb0: HOST MAC f2:70:ee:4f:2d:fe
g_ether gadget: Ethernet Gadget, version: Memorial Day 2008
g_ether gadget: g_ether ready
musb-hdrc musb-hdrc.0: MUSB HDRC host driver
musb-hdrc musb-hdrc.0: new USB bus registered, assigned bus number 2
usb usb2: New USB device found, idVendor=1d6b, idProduct=0002
usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb2: Product: MUSB HDRC host driver
usb usb2: Manufacturer: Linux 2.6.37 musb-hcd
usb usb2: SerialNumber: musb-hdrc.0
hub 2-0:1.0: USB hub found
hub 2-0:1.0: 1 port detected
mice: PS/2 mouse device common for all mice
omap_device: omap_i2c.1: new worst case activate latency 0: 152587
input: TSC2004 Touchscreen as /devices/virtual/input/input0
rtc-s35390a 1-0030: rtc core: registered rtc-s35390a as rtc0
i2c /dev entries driver
Linux video capture interface: v2.00
usbcore: registered new interface driver uvcvideo
USB Video Class driver (v1.0.0)
vpfe_init
vpfe-capture vpfe-capture: v4l2 device registered
vpfe-capture vpfe-capture: video device registered
tvp514x 3-005c: tvp514x 3-005c decoder driver registered !!
tvp514x 3-005c: Write: retry ... 0
tvp514x 3-005c: Write: retry ... 1
tvp514x 3-005c: Write: retry ... 2
tvp514x 3-005c: Write: retry ... 3
tvp514x 3-005c: Write: retry ... 4
tvp514x 3-005c: Write: retry ... 5
tvp514x 3-005c: Write failed. Err[-121]
tvp514x 3-005c: Unable to turn on decoder
tvp514x 3-005c: Read: retry ... 0
tvp514x 3-005c: Read: retry ... 1
tvp514x 3-005c: Read: retry ... 2
tvp514x 3-005c: Read: retry ... 3
tvp514x 3-005c: Read: retry ... 4
tvp514x 3-005c: Read: retry ... 5
tvp514x 3-005c: Unable to query std
vpfe-capture vpfe-capture: v4l2 sub device tvp5146 registered
vpfe_register_ccdc_device: DM6446 CCDC
DM6446 CCDC is registered with vpfe.
omap_device: omap_wdt.-1: new worst case activate latency 0: 30517
OMAP Watchdog Timer Rev 0x31: initial timeout 60 sec
omap_device: omap_wdt.-1: new worst case deactivate latency 0: 30517
usbcore: registered new interface driver usbhid
usbhid: USB HID core driver
oprofile: hardware counters not available
oprofile: using timer interrupt.
TCP cubic registered
Initializing XFRM netlink socket
NET: Registered protocol family 17
NET: Registered protocol family 15
can: controller area network core (rev 20090105 abi 8)
NET: Registered protocol family 29
can: raw protocol (rev 20090105)
can: broadcast manager protocol (rev 20090105 t)
Registering the dns_resolver key type
VFP support v0.3: implementor 41 architecture 3 part 30 variant c rev 1
ThumbEE CPU extension supported.
Power Management for TI OMAP3.
clock: disabling unused clocks to save power
rtc-s35390a 1-0030: setting system clock to 2000-01-01 00:00:00 UTC (946684800)
omap_vout omap_vout: Buffer Size = 3686400
omap_vout omap_vout: : registered and initialized video device 1
omap_vout omap_vout: Buffer Size = 3686400
omap_vout omap_vout: : registered and initialized video device 2
davinci_mdio davinci_mdio: resetting idled controller
net eth0: attached PHY driver [SMSC LAN8710/LAN8720] (mii_bus:phy_addr=ffffffff:00, id=7c0f1
)
IP-Config: Guessing netmask 255.0.0.0
IP-Config: Complete:
     device=eth0, addr=10.0.42.2, mask=255.0.0.0, gw=10.0.42.1,
     host=10.0.42.2, domain=, nis-domain=(none),
     bootserver=255.255.255.255, rootserver=10.0.42.1, rootpath=
PHY: ffffffff:00 - Link is Up - 100/Full
VFS: Mounted root (nfs filesystem) on device 0:14.
Freeing init memory: 200K
INIT: version 2.86 booting
Please wait: booting...
Starting udev
udevd (608): /proc/608/oom_adj is deprecated, please use /proc/608/oom_score_adj instead.
Root filesystem already rw, not remounting
Caching udev devnodes
Populating dev cachemv: cannot rename '/tmp/devices': No such file or directory
ALSA: Restoring mixer settings...
NOT configuring network interfaces: / is an NFS mount
/usr/sbin/alsactl: load_state:1625: No soundcards found...
Thu Jul  7 13:19:00 UTC 2011
INIT: Entering runlevel: 5
Starting system message bus: dbus.
Starting Hardware abstraction layer hald
Starting Dropbear SSH server: dropbear.
Starting telnet daemon.
Starting syslogd/klogd: done
Starting thttpd.
Starting PVR
Usage: insmod filename [args]
FATAL: Module omaplfb not found.
FATAL: Module bufferclass_ti not found.
BusyBox v1.13.2 (2011-07-05 21:30:53 CDT) multi-call binary

am3517-evm login:

So, just to let people know, after working on that issue for 3 days, I noticed that all the post I read and the User Guide from LogicPD do not use linux 2.6.37 but older (2.6.32).

Therefore I tried with the same kernel version 2.6.32 and it turned out that it's working.

So, it seems that there is a bug somewhere or a command is missing if I want to do the same with the linux kernel 2.6.37 provided by TI in their PSP.

Can someone recommand me a good Jtag debugger. Is BDI3000 is good for the AM3517?

Thanks

It turns out that the omap serial drivers do not implement polling, which prevents the -g option in sysrq-trigger.  See the blog below for more details.

http://e2e.ti.com/support/embedded/linux/f/354/p/132640/479435.aspx#479435

Here's the patch file I created based off the blog to fix this problem, for /drivers/serial/omap-serial.c

907a908,920
> #ifdef CONFIG_CONSOLE_POLL
> static int serial_omap_console_getchar(struct uart_port *port)
> {
>        struct uart_omap_port *up = (struct uart_omap_port *)port;
>        unsigned char lsr = serial_in(up, UART_LSR);
>
>        if (!(lsr & UART_LSR_DR))
>                return NO_POLL_CHAR;
>
>        return serial_in(up, UART_RX);
> }
> #endif
>
915a929,935
> #ifdef CONFIG_CONSOLE_POLL
> static void serial_omap_console_putchar_polling(struct uart_port *port, unsigned char ch)
> {
>     serial_omap_console_putchar(port, ch);
> }
> #endif
>
1024a1045,1048
> #ifdef CONFIG_CONSOLE_POLL
>     .poll_get_char  = serial_omap_console_getchar,
>     .poll_put_char  = serial_omap_console_putchar_polling,
> #endif

This brought kdb up for me as far as I could tell, but I am still having trouble getting kgdb up.  Also, ekgdboc is used for early kernel debugger launching I believe, although I have not brought kgdb up at all yet.