0xfe800000

TI 社製 16C550 互換 UART

RedBoot> x -b 0xfe800000 -l 8 -1
FE800000: 00 00 C1 03 00 00 F0 FF                           |........        |

RedBoot> mfill -b 0xfe800000 -p 0x30 -l 1 -1	# com_data <- '0'
0RedBoot> mfill -b 0xfe800000 -p 0x31 -l 1 -1	# com_data <- '1'
1RedBoot>