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verified publisher icon jfedor2

BIOS, bootloader and re-plug

Open philinp opened this issue 2 years ago • 2 comments

My setup: HP Spectre x360 laptop <--(direct USB connection, no hub)--> Adafruit Feather RP2040 with USB Type A Host (latest firmware r2023-07-19) <---> Apple Magic Keyboard 2.

  1. After hard reboot or power on the laptop enters BIOS, keyboard doesn't work in BIOS even if it's re-plugged, however red led indicator is blinking on the Adafruit board while typing.
  2. Then laptop loads my bootloader and bootloader asks for the password. Keyboard still doesn't work. Red led indicator is blinking while typing. Re-plugging doesn't help.
  3. After Windows 11 loaded, keyboard needs to be re-plugged to make it work.

If it has to be debugged in order to fix it, how do I do it?

philinp avatar Sep 01 '23 15:09 philinp

1 and 2 might be just because HID Remapper doesn't support boot protocol mode. Not sure about 3.

jfedor2 avatar Sep 01 '23 17:09 jfedor2

generally if you want to debug software or hardware without understanding the issue, you start by breaking the whole into two parts, then testing each half separately for the bug. halves are the fastest method to find a bug. so you find that the bug is confined to one half, so then you mark the other half as good, and you divide the bugged half again in two. This method seems slow, but it only takes about 30 dividing steps to isolate the bug.

itsnoteasy avatar Sep 01 '23 20:09 itsnoteasy