handle probed stlink with unconnected target properly #943
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do not abort in case of load device param "error" : this is supposed to return -1 if device is "unknown" or not detected, which is not reaaally an error. we want probe to tell us what is the connected device even if we can not operate it we want probe to tell us that it can not operate it, not to hide the connected stlink
check flash type before attempting to continue flash operations
Check if connected target chip id is known. Some more info regarding connected chip should be set in chipid to know if debugging / attach is possible, but not yet. some more checks should be done to generate flash map / handle flashing if flash type is not supported..
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grevaillot: stlink_open_usb now returns without failure when no target is detected, or when target is not fully handled. Fix behaviour of tools in that case.
nb: st-util handling should maybe be discussed. currently it allows to start with no supported flash, which is what i would expected from a debugging tool, but flashing wont work obvs.
(Closes #432, #835)