branches: 1.1.2; 1.1.4; 1.1.12; Add two new versions of the mbr code that directly access a serial port. 'mbr_com0' assumes the BIOS has initialised the baud rate (etc) 'mbr_com0_9600' initialises the rate to 9600 Both have the functionality from 'mbr_ext' (ie they can boot from an extended partition). As compiled, the io_address for the serial port is taken from BIOS data. (this should keep tls@ happy!)
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