Glasgow Embedded / Glasgow - History

firmware, software: change revision format from revX to revXN.

Until now, the firmware and software did not know the specific board
variant. This doesn't let us work around board bugs.

applet.i2c_master: require revC+.

The I2CPadsWrapper hack was horrible to use even when it worked.
I can't in good conscience recommenda anyone with a revA/B do that,
so let's get rid of it.

firmware: persist voltage limit on writes, not reads.

Oops... this would have written the EEPROM on each `glasgow voltage`
invocation.

applet.jtag: enumerate-ir: make more robust to missing DRs.

A missing DR is a DR that leaves TDO unconnected when it is selected.

applet.jtag_mips: update the lists of tested configurations.

applet.jtag: enumerate-ir: handle incorrect TAP selection.

applet.jtag: reset TAP chain before selecting a TAP.

Selecting a TAP requires reading IDCODE/BYPASS from DR, which means
that a TAP chain reset was a precondition for select_tap(), but this
wasn't intended or documented. The current design requires a reset,
so just add that.

Since all derived applets want to select a TAP, remove the TAP reset
via TMS from run(); however, keep TAP reset via TRST#, because that
enables the TRST# driver.