Improper accessing the Nuvoton eSIO causes problems with other monitoring software

[malikm]

Nct677X doesn't properly access internal registers of the eSIO (ReadByte, WriteByte) which results in blocking other software.
The eSIO features a "sort of mutex" to handle parallel access, which is realized via the PagePort register (EC_SPACE_PAGE_REGISTER_OFFSET).
When PagePort != 0xFF => There's someone accessing the registers.
OHM doesn't wait for "access clear" but instead acquires the access straight. At the end of access it doesn't release it.
Proper access sequence should be:

1. Wait till PagePort == 0xFF
2. Set the desired bank and do your access.
3. Write 0xFF to PagePort to release the "mutex"