Add ESP32-P4 support

[orsolic]

Here is commit with start of support for ESP32-P4.

I have started working on flashing support but I need to shelve that plan for the time being.
I am pushing the things which seems to work - patch is rough, but more will hopefully come later.

Tested with BMA and ESP-prog (FT2232H) on FreeBSD with Waveshare ESP32-P4 board with flashed IDF example.

Works:

• JTAG scan
• attach to target
• run program
• reset
• hardware breakpoint
• continue
• printing of var in SRAM

>>> p var
$4 = 123
>>> p &var
$5 = (uint32_t *) 0x4ff26334
>>> x /d 0x4ff26334
0x4ff26334:     123

• changing value of var:

>>> set var var = 100
>>> p var
$8 = 100
>>> x /d 0x4ff26334
0x4ff26334:     100

What doesn't work:

• software breakpoint (needs flash support)
• stepping
• single instruction stepping

[dragonmux]

This looks interesting - there are some issues though, particular involving repeated scans within a session. Please see our review notes for details.

[dragonmux]

Do please note that this will only work for a single scan - the next run through will break. This is because previous_idx is static and so only initialised once on program start and is unable to be reset to 0.

It might be better to make the previous index used a return parameter to this function stored as a local in the calling context, this way it can be properly reinitialised on each new scan.

[orsolic]

It works for multiple scans - first scan:
jtag_device_get_quirks() returning idx: 40
jtag_device_get_quirks() returning idx: 41

Second scan:
jtag_device_get_quirks() returning idx: 40
jtag_device_get_quirks() returning idx: 41

If it isn't static it will fail on the 1st scan:
jtag_device_get_quirks() returning idx: 40
jtag_device_get_quirks() returning idx: 40
jtag_scan: IR does not match the expected value, bailing out

[orsolic]

Thanks for the review!
I've force pushed the updated changes.

[orsolic]

I've accidentally pushed the wrong branch (the one with included FreeBSD build fix), then deleted it, which caused this PR to be closed, and now I can't reopen it.
Can you reopen it? Or, should I create a new PR?

[esden]

The problem is that you deleted the branch on your repository, so this PR does not have anything to reference to. I think you will have to open a new pull request.