3 ms·
SWD and JTAG are both disabled in RDP2. The OTP bytes were there on the F4 too.
by flyinglizard 8y ago
SWD and JTAG are both disabled in RDP2.
The OTP bytes were there on the F4 too.
- duskwuff 8y agoRight; the specific quote I'm referring to is: > The JTAG port is permanently disabled when Level 2 is active (acting as a JTAG fuse). As a consequence, boundary scan cannot be performed. (RM0385, page 89) I'm pretty sure that this quote is only intended to mean that setting RDP2 disables JTAG boundary scan, as if a JTAG fuse were blown. I don't believe there is any actual fuse involved; AN4701 (the document you're quoting) may be the result of another ST employee misinterpreting the reference manual as a statement that there is an actual fuse.
- nneonneo 8y agoThat's too bad - I would call that misleading documentation. Is there a reliable way to check for sure whether they mean a physical fuse, or a "virtual" fuse derived from the flash bits?