Zipit Z2
如何使用JTAG燒錄UBoot
參考資訊：
1. jtag
2. using-a-raspberry-pi-as-a-jtag-debugger-to-recover-a-bricked-zipit
連接JTAG和Zipit Z2
Debian 9(x64)
$ cd $ sudo apt-get update $ sudo apt-get install openocd $ vim olimex-arm-usb-ocd-h.cfg
interface ftdi ftdi_device_desc "Olimex OpenOCD JTAG ARM-USB-OCD-H" ftdi_vid_pid 0x15ba 0x002b ftdi_layout_init 0x0908 0x0b1b ftdi_layout_signal nSRST -oe 0x0200 ftdi_layout_signal nTRST -data 0x0100 ftdi_layout_signal LED -data 0x0800 adapter_nsrst_delay 0 jtag_ntrst_delay 200 reset_config trst_and_srst separate adapter_khz 16
$ vim z2.cfg
jtag newtap pxa270 cpu -irlen 7 -ircapture 0x1 -irmask 0x7f -expected-id 0x49265013 -expected-id 0x79265013 target create pxa270.cpu xscale -endian little -chain-position pxa270.cpu pxa270.cpu configure -work-area-phys 0x5c000000 -work-area-size 0x10000 -work-area-backup 0 flash bank pxa270.flash cfi 0x00000000 0x1000000 2 2 pxa270.cpu
$ sudo openocd -f olimex-arm-usb-ocd-h.cfg -f z2.cfg Open On-Chip Debugger 0.9.0 (2018-01-21-13:43) Licensed under GNU GPL v2 For bug reports, read http://openocd.org/doc/doxygen/bugs.html adapter_nsrst_delay: 0 Info : auto-selecting first available session transport "jtag". To override use 'transport select <transport>'. jtag_ntrst_delay: 200 trst_and_srst separate srst_gates_jtag trst_push_pull srst_open_drain connect_deassert_srst adapter speed: 16 kHz Info : pxa270.cpu: hardware has 2 breakpoints and 2 watchpoints Info : clock speed 16 kHz Info : JTAG tap: pxa270.cpu tap/device found: 0x79265013 (mfg: 0x009, part: 0x9265, ver: 0x7)
$ telnet localhost 4444 Trying ::1... Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. Open On-Chip Debugger > reset halt JTAG tap: pxa270.cpu tap/device found: 0x79265013 (mfg: 0x009, part: 0x9265, ver: 0x7) Bad value '00' captured during DR or IR scan: check_value: 0x02 check_mask: 0x07 JTAG error while writing DCSR target state: halted target halted in ARM state due to debug-request, current mode: Supervisor cpsr: 0x180000d3 pc: 0x00000000 MMU: disabled, D-Cache: disabled, I-Cache: disabled (processor reset) > flash probe 0 Flash Manufacturer/Device: 0x0089 0x8865 configuration specifies 0x1000000 size, but a 0x800000 size flash was found flash 'cfi' found at 0x00000000 > flash write_image erase unlock u-boot.bin 0 auto erase enabled auto unlock enabled wrote 131072 bytes from file u-boot.bin in 98.155098s (1.304 KiB/s)