1 – bootldr – Unknown exactly, something to do with checking the motherboard
2 – bootldr – Eeprom check failed
3 – bootldr – ??/not used
4 – bootldr – Ram check failed
5 – kernel – HDD not locked (retail bioses require the hd to be locked)
6 – kernel – Cannot unlock HDD
7 – kernel – HDD timeout
8 – kernel – No HDD found
9 – kernel – HDD parameters (PIO/DMA/or size {debug}, certain size minimum is required for debug)
10 – kernel – DVD timeout
11 – kernel – No DVD Founnd
12 – kernel – DVD parameters (PIO/DMA)
13 – kernel – Dashboard launch fail (due to missing/bad key, or anything else that would prevent it from running) and the dashboard didn’t specify why it failed.
16 – dashboard – Other files to do with dashboard / dashboard settings (specific dashboard error)
17 – – ??/not used
18 – – ??/not used
19 – – ??/not used
20 – kernel – The dashboard was attempted to load and failed; It was a cold boot, and the dashboard didn’t specify why it failed, but it (for some reason) needed to be noted that the dvd passed the challenge/response authentication
21 – anywhere – This error says that the machine was booted to display a error, basically someone told the machine to reboot (or launch a xbe) with this flag, and the error code just means its been rebooted by the flag