Ok i`ll try to see if i can get that pc register .
i would like to note that i do not have al the jtag pins like the seggler jlink has
i`ve the GND , TCK, TMS, TDI, TDO, SRST, TRST and then the last 2 are optional i read i head to prefer the SRST instead of the TRST
but i could not get it to work with either
here`s my boot log before the halt
U-Boot 2010.09-R10 (Dec 14 2015 - 19:28:18)
CPU: Freescale i.MX27 at 400.168 MHz
Prodrive B.V. ED2.0
DRAM: 128 MiB
NAND: 128 MiB
LCD: Initializing LCD frambuffer at a1400000
LCD: 800x480, pbb 4
LCD: Drawing the logo...
In: serial
Out: serial
Err: serial
Configure for LCD: TDA-WVGA0700F00048
LCD: Initializing LCD frambuffer at a1400000
LCD: 800x480, pbb 4
LCD: Drawing the logo...
Display-bmp: 800 x 480 with 16777216 colors
Net: FEC
Warning: FEC MAC addresses don't match:
Address in SROM is 00:00:20:03:00:00
Address in environment is 00:0f:11:07:f1:9b
Enter password - autoboot in 2 sec...
NAND read: device 0 offset 0x300000, size 0x300000
3145728 bytes read: OK
## Booting kernel from Legacy Image at a1000000 ...
Image Name: Linux-2.6.36-R10-h25
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 2245600 Bytes = 2.1 MiB
Load Address: a0008000
Entry Point: a0008000
Verifying Checksum ... OK
Loading Kernel Image ... OK
OK
Starting kernel ...
Uncompressing Linux... done, booting the kernel.
Linux version 2.6.36-R10-h25 (jbraam@dvl) (gcc version 4.5.3 20110223 (prerelease) (GCC) ) #1 PREEMPT Tue May 24 11:41:01 CEST 2016
CPU: ARM926EJ-S [41069264] revision 4 (ARMv5TEJ), cr=00053177
CPU: VIVT data cache, VIVT instruction cache
Machine: Prodrive B.V ED2.0
Memory policy: ECC disabled, Data cache writeback
Built 1 zonelists in Zone order, mobility grouping on. Total pages: 32512
Kernel command line: ubi.mtd=4 root=ubi0:rootfs rw rootfstype=ubifs mtdparts=mxc_nand:512K@0x00100000(u-boot-env)ro,1536K(splash-image),3M(kernel),3M(kernel-backup),119M(rootfs) console=ttymxc0,115200 mem=128M lpj=999424 lcd=TDA-WVGA0700F00048
PID hash table entries: 512 (order: -1, 2048 bytes)
Dentry cache hash table entries: 16384 (order: 4, 65536 bytes)
Inode-cache hash table entries: 8192 (order: 3, 32768 bytes)
Memory: 128MB = 128MB total
Memory: 125536k/125536k available, 5536k reserved, 0K highmem
Virtual kernel memory layout:
vector : 0xffff0000 - 0xffff1000 ( 4 kB)
fixmap : 0xfff00000 - 0xfffe0000 ( 896 kB)
DMA : 0xffa00000 - 0xffe00000 ( 4 MB)
vmalloc : 0xc8800000 - 0xf4000000 ( 696 MB)
lowmem : 0xc0000000 - 0xc8000000 ( 128 MB)
modules : 0xbf000000 - 0xc0000000 ( 16 MB)
.init : 0xc0008000 - 0xc0024000 ( 112 kB)
.text : 0xc0024000 - 0xc03ea000 (3864 kB)
.data : 0xc0404000 - 0xc042a5a0 ( 154 kB)
Hierarchical RCU implementation.
RCU-based detection of stalled CPUs is disabled.
Verbose stalled-CPUs detection is disabled.
NR_IRQS:272
MXC IRQ initialized
MXC GPIO hardware
Console: colour dummy device 80x30
Calibrating delay loop (skipped) preset value.. 199.88 BogoMIPS (lpj=999424)
pid_max: default: 32768 minimum: 301
Mount-cache hash table entries: 512
CPU: Testing write buffer coherency: ok
NET: Registered protocol family 16
Configured for LCD: TDA-WVGA0700F00048
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
cfg80211: Calling CRDA to update world regulatory domain
Switching to clocksource mxc_timer1
NET: Registered protocol family 2
IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
TCP established hash table entries: 4096 (order: 3, 32768 bytes)
TCP bind hash table entries: 4096 (order: 2, 16384 bytes)
TCP: Hash tables configured (established 4096 bind 4096)
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
RPC: Registered udp transport module.
RPC: Registered tcp transport module.
RPC: Registered tcp NFSv4.1 backchannel transport module.
msgmni has been set to 245
io scheduler noop registered (default)
imx-fb imx-fb.0: PreserveUBootFramebuffer(1): xres=800, yres=480 [skip _update_lcdc]
imx-fb imx-fb.0: PreserveUBootFramebuffer(2): xres=800, yres=480 [skip _update_lcdc]
Console: switching to colour frame buffer device 100x30
imx-fb imx-fb.0: fb0: DISP0 BG fb device registered successfully.
imx-fb imx-fb.0: PreserveUBootFramebuffer(3): xres=800, yres=480 [skip _update_lcdc]
imx-fb imx-fb.0: fb1: DISP0 FG fb device registered successfully.
Serial: IMX driver
imx-uart.0: ttymxc0 at MMIO 0x1000a000 (irq = 20) is a IMX
console [ttymxc0] enabled
imx-uart.1: ttymxc1 at MMIO 0x1000b000 (irq = 19) is a IMX
imx-uart.2: ttymxc2 at MMIO 0x1000c000 (irq = 18) is a IMX
NAND device: K9F1G08U0E detected, disabling sub-page writes
NAND device: Manufacturer ID: 0xec, Chip ID: 0xf1 (Samsung NAND 128MiB 3,3V 8-bit)
Scanning device for bad blocks
RedBoot partition parsing not available
5 cmdlinepart partitions found on MTD device mxc_nand
Creating 5 MTD partitions on "mxc_nand":
0x000000100000-0x000000180000 : "u-boot-env"
0x000000180000-0x000000300000 : "splash-image"
0x000000300000-0x000000600000 : "kernel"
0x000000600000-0x000000900000 : "kernel-backup"
0x000000900000-0x000008000000 : "rootfs"
UBI: attaching mtd4 to ubi0
UBI: physical eraseblock size: 131072 bytes (128 KiB)
UBI: logical eraseblock size: 126976 bytes
UBI: smallest flash I/O unit: 2048
UBI: VID header offset: 2048 (aligned 2048)
UBI: data offset: 4096
UBI: max. sequence number: 34771
UBI: attached mtd4 to ubi0
UBI: MTD device name: "rootfs"
UBI: MTD device size: 119 MiB
UBI: number of good PEBs: 952
UBI: number of bad 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: 952
UBI: number of PEBs reserved for bad PEB handling: 9
UBI: max/mean erase counter: 118/36
UBI: image sequence number: 620272818
UBI: background thread "ubi_bgt0d" started, PID 319
at25 spi0.0: 32 KByte at25640B eeprom, pagesize 64
spi_imx spi_imx.0: probed
FEC Ethernet Driver
fec_enet_mii_bus: probed
tun: Universal TUN/TAP device driver, 1.6
tun: (C) 1999-2004 Max Krasnyansky <
maxk@qualcomm.com>
ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
eureka got somewhere
pi@raspberrypi:~/openocd-0.9.0 $ telnet localhost 4444
Trying ::1...
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
Open On-Chip Debugger
> soft_reset_halt
requesting target halt and executing a soft reset
target state: halted
target halted in ARM state due to debug-request, current mode: Supervisor
cpsr: 0x000000d3 pc: 0x00000000
MMU: disabled, D-Cache: disabled, I-Cache: disabled
> reset halt
JTAG tap: imx27.etb tap/device found: 0x1b900f0f (mfg: 0x787, part: 0xb900, ver: 0x1)
JTAG tap: imx27.cpu tap/device found: 0x07926121 (mfg: 0x090, part: 0x7926, ver: 0x0)
target state: halted
target halted in ARM state due to debug-request, current mode: Supervisor
cpsr: 0x20000093 pc: 0xc014316c
MMU: disabled, D-Cache: disabled, I-Cache: disabled
srst pulls trst - can not reset into halted mode. Issuing halt after reset.
NOTE! Severe performance degradation without fast memory access enabled. Type 'help fast'.
> load_image u-boot.bin 0xa1f00000
166504 bytes written at address 0xa1f00000
downloaded 166504 bytes in 9.972180s (16.306 KiB/s)
> resume 0xa1f00000
i tried this sequence multiple times and this seems to work for my raspberry setup notice the reset halt
that one gave me the right registers i quess