H. Peter Anvin wrote:
Add generic support for debugging consoles (simple I/O ports which when written to cause debugging output to be written to a target.) The current implementation matches Bochs' port 0xe9, allowing the same debugging code to be used for both Bochs and Qemu.
Your implementation seems to miss the read part, unless you don't want to be compatible with Bochs. user.dbk says: "Reading from port 0xE9 will will return 0xe9 to let you know if the feature is available." - Sebastian
