In general, the st-flash utility has been working fairly well for me. Thank you for your excellent work, guys. I believe the issues I've had, except for the one I am creating this ticket for, have open tickets already.

The problem I'm having is that I'm planing on creating an interrupt driven design. So I have written an experimental program that sets up an interrupt (connected to the user button) and then puts the CPU to sleep by running the __WFI() function. When I flash a program that runs that function, subsequent flashing with st-flash does not work. To get back in touch with the chip, I have to boot into Windows and use the STM-32 ST-LINK Utility from ST to erase the flash. A clue to what is wrong is that the STM-32 ST-LINK Utility does not work either, unless "Connect under Reset" is enabled in Settings.

After flashing the program that runs the __WFI() function, any attempt to flash causes the following error:

dahl@ubuntu:~/Desktop/3/stlink/example/32l_lcd$ make write
../../flash/flash write lcd.bin 0x08000000
2012-02-09T23:25:54 INFO src/stlink-common.c: Loading device parameters....
2012-02-09T23:25:54 WARN src/stlink-common.c: unknown chip id! 0
stlink_sram_flash() == -1
make: *** [write] Error 255

Any attempt to erase causes (note how the program displays a different chip id):

make: *** [write] Error 255
dahl@ubuntu:~/Desktop/3/stlink/example/32l_lcd$ ../../flash/flash erase
2012-02-09T23:28:01 INFO src/stlink-common.c: Loading device parameters....
2012-02-09T23:28:01 WARN src/stlink-common.c: unknown chip id! 0xe0042000
Mass erasing

If I hold the Reset button while flashing:

ahl@ubuntu:~/Desktop/3/stlink/example/32l_lcd$ ../../flash/flash erase
2012-02-09T23:28:28 INFO src/stlink-common.c: Loading device parameters....
2012-02-09T23:28:28 INFO src/stlink-common.c: Device connected is: L1 Med-density device, id 0x10386416
2012-02-09T23:28:28 INFO src/stlink-common.c: SRAM size: 0x4000 bytes (16 KiB), Flash: 0 bytes (0 KiB) in pages of 256 bytes

Even after I erase the flash in Windows, I get the following. This is fixed by pushing the Reset button on the card:

dahl@ubuntu:~/Desktop/3/stlink/example/32l_lcd$ make write
../../flash/flash write lcd.bin 0x08000000
2012-02-10T14:13:21 INFO src/stlink-common.c: Loading device parameters....
2012-02-10T14:13:21 INFO src/stlink-common.c: Device connected is: L1 Med-density device, id 0x10386416
2012-02-10T14:13:21 INFO src/stlink-common.c: SRAM size: 0x4000 bytes (16 KiB), Flash: 0x20000 bytes (128 KiB) in pages of 256 bytes
2012-02-10T14:13:21 INFO src/stlink-common.c: Attempting to write 7332 (0x1ca4) bytes to stm32 address: 134217728 (0x8000000)
2012-02-10T14:13:21 WARN src/stlink-common.c: pecr.pelock not clear (0x7)
2012-02-10T14:13:21 WARN src/stlink-common.c: Failed to erase_flash_page(0x8000000) == -1
stlink_fwrite_flash() == -1
make: *** [write] Error 255