Chapter 4
Troubleshooting Procedures
4-19
4.7.2.7
Parallel Port Diagnostic
To start the parallel port diagnostic, type
6
at the
OBdiag
Menu prompt. The
parallel port diagnostic performs the following in sequence:
1.
sio-passive-lb
sets up the SuperI/O configuration register to enable
extended/compatible parallel port select, then does a write 0, walk-one, write 0 x
ff to the data register. It verifies the results by reading the status register.
2.
dma_read
enables ECP mode, ECP DMA configuration, and FIFO test mode.
Transfers 16 bytes of data from memory to the parallel port device and then
verifies the data is in TFIFO.
The following code example shows the parallel port diagnostic output message.
4.7.2.8
Serial Port Diagnostic
To start the serial port diagnostic, type
7
at the
OBdiag
Menu prompt. The serial
port A diagnostic invokes the
uart_loopback
test which transmits and receives
128 characters and checks serial port A transaction validity.
The following code example shows the serial port diagnostic output message.
CODE EXAMPLE 4-14
Parallel Port Diagnostic Output Message
Enter (0-12 tests, 13 -Quit, 14 -Menu) ===> 6
TEST='parallel_port_test'
SUBTEST='dma_read'
Enter (0-12 tests, 13 -Quit, 14 -Menu) ===>
CODE EXAMPLE 4-15
Serial Port Diagnostic Output Message
Enter (0-12 tests, 13 -Quit, 14 -Menu) ===> 7
TEST='uarta_test'
BAUDRATE='1200'
SUBTEST='internal_loopback'
BAUDRATE='1800'
SUBTEST='internal_loopback'
BAUDRATE='2400'
SUBTEST='internal_loopback'
BAUDRATE='4800'
SUBTEST='internal_loopback'
BAUDRATE='9600'
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