I was trying to use OpenOCD and STLink-v2 to flash a board powered by Atmel SAML21 microcontroller, using this openocd.cfg:
# SAML21 X Pro Target # Using stlink as SWD programmer source [find interface/stlink-v2.cfg] # SWD as transport transport select hla_swd # Use SAML21 target set WORKAREASIZE 0x4000 source [find target/at91samdXX.cfg]
But OpenOCD was reporting this error:
Warn : UNEXPECTED idcode: 0x0bc11477 Error: expected 1 of 1: 0x4ba00477
Then I modified at91samdXX.cfg replacing 0x4ba00477 by 0x0bc11477, but the “reset halt” command was failing.
Then I decided to use a J-Link programmer:
$ sudo JLinkExe SEGGER J-Link Commander V4.98e ('?' for help) Compiled May 5 2015 11:49:39 DLL version V4.98e, compiled May 5 2015 11:49:35 Firmware: J-Link ARM V8 compiled Nov 28 2014 13:44:46 Hardware: V8.00 S/N: 268006167 OEM: SEGGER-EDU Feature(s): FlashBP, GDB VTarget = 3.300V Info: TotalIRLen = ?, IRPrint = 0x..000000000000000000000000 Info: TotalIRLen = ?, IRPrint = 0x..000000000000000000000000 No devices found on JTAG chain. Trying to find device on SWD. Info: Found SWD-DP with ID 0x0BC11477 Info: Found Cortex-M0 r0p1, Little endian. Info: FPUnit: 4 code (BP) slots and 0 literal slots Info: CoreSight components: Info: ROMTbl 0 @ 41003000 Info: ROMTbl 0 : 9F0FC000, CID: B105100D, PID: 000BB4C0 ROM Table Info: ROMTbl 1 @ E00FF000 Info: ROMTbl 1 : FFF0F000, CID: B105E00D, PID: 000BB008 SCS Info: ROMTbl 1 : FFF02000, CID: B105E00D, PID: 000BB00A DWT Info: ROMTbl 1 : FFF03000, CID: B105E00D, PID: 000BB00B FPB Info: ROMTbl 0 : 00003000, CID: B105900D, PID: 001BB932 MTB-M0+ Cortex-M0 identified. Target interface speed: 100 kHz J-Link>exec device = ATSAML21J18 Info: Device "ATSAML21J18" selected. J-Link>loadbin /tmp/nuttx.bin, 0x0 Downloading file [/tmp/nuttx.bin]... ************************** WARNING: CPU is running at low speed (5301 kHz). ************************** Info: J-Link: Flash download: Flash programming performed for 1 range (44288 bytes) Info: J-Link: Flash download: Total time needed: 7.121s (Prepare: 0.698s, Compare: 0.255s, Erase: 0.000s, Program: 6.106s, Verify: 0.009s, Restore: 0.051s) O.K. J-Link> J-Link>r Reset delay: 0 ms Reset type NORMAL: Resets core & peripherals via SYSRESETREQ & VECTRESET bit. J-Link>g
J-Link also detected the same idcode: 0x0bc11477 (I think this is the ID for Cortex-M0 microcontroller), then OpenOCD is correct. Using J-Link I got nuttx.bin flashed correctly.
Now I need to investigate about the STLink-v2 reset issue.