"Unsupported device selected" error with loader strings

[multiplemonomials]

I've been testing a chip that requires a loader string as part of the device argument. For example, on the command line, I'd pass -Device MIMXRT1062xxx5B?BankAddr=0x60000000&Loader=QSPI. However, when I try the corresponding code in pylink:

jlink.connect("MIMXRT1062xxx5B?BankAddr=0x60000000&Loader=QSPI")

it dies with an "Unsupported device selected" exception from JLink.get_device_index(). It looks like this is because get_device_index() expects an un-adorned string, e.g. "MIMXRT1062xxx5B".

As a workaround, I figured out that if I change the connect() implementation to pass only the part of chip_name before the '?' character to get_device_index(), everything works. The loader string correctly gets passed via code after that, and I can flash and run code.

[multiplemonomials]

Hmm, on further testing, turns out that flashing doesn't actually work with the above workaround. I have to run

jlink.exec_command('DEVICE_SelectLoader BankAddr=0x60000000 Loader=QSPI')

before calling connect(). Maybe connect() could be updated to parse out the loader string and pass it via DEVICE_SelectLoader?

Also, discovered that on this device, you have to call jlink.reset(halt=True) immediately before calling flash_file, or flashing fails. Not sure what's up with that...

[hkpeprah]

I imagine we could parse what is after the ?, though I think we would have to make sure that no device name contains a query string. Something like:

device_list = name.split('?')
device_name = next(device_list)
device_loader = next(device_list, None)

<...>

if device_loader is not None:
    self.exec_command(f'DEVICE_SelectLoader {" ".join(device_loader.split("&"))}')

Thoughts?

[multiplemonomials]

Hmm, I think it might be possible to have a loader string with multiple banks and loaders for them? I'm not sure what the syntax would look like though. Maybe you'd end up with something like:

MIMXRT1062xxx5B?BankAddr=0x60000000&Loader=QSPI&BankAddr=0x70000000&Loader=OSPI

The parser would have to handle this too. And we'd need to find an example of a real loader string like this to be sure.

[bbilas]

I encountered the same problem during the development using the board with MIMXRT1062 MCU. The command that I use to flash is JLinkExe -nogui 1 -if swd -speed auto -device 'MIMXRT1062xxx6A?BankAddr=0x60000000&Loader=QSPI' -CommanderScript /tmp/runner.jlink -nogui 1 where runner.jlink is

ExitOnError 1
r
loadfile "/tmp/build/zephyr/zephyr.hex"
g
writeDP 1 0
readDP 1
q

Is there any PR that adds support for this?

[hkpeprah]

There is no PR yet that adds this support, unfortunately.