T530/w530 disassembling/flashing notes

@eganonoa wrote : "Note: it can be tricky to properly read the 8MB chip on the T530 and W530 (see #996). This appears to be because the two chips share a power source on these boards (see generally). This is true for both the Rasbperry Pi and the CH431a. There appears to be two workarounds: (1) the Wake on Lan method (which has the one downside of only working once, because it is not supported by coreboot and is, therefore, not available after flashing); or (2) keeping the CMOS battery plugged in, which works also post-flashing. Both methods provide a little extra power to the board and appear to then be sufficient to get enough power to the 8MB chip to get a proper read of it. The Skulls team generally suggest using an external power source with the CH341a, and it's possible that this might help, but I have not tested."

From https://github.com/osresearch/heads/pull/1072#issue-1071482504

This needs to be documented properly

Start with the T530/W530 disassembly and flashing documentation in this wiki, then compare the quoted notes with Heads pull request #1072 and issue #996. Document the 8MB-chip read problem, the Wake-on-LAN and CMOS-battery workarounds, and the CH341a power guidance, distinguishing tested observations from untested possibilities.