Sun Microsystems Ultra 5, Руководство по обслуживанию

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4-18 Sun Ultra 5 Service Manual • February 2000
4.7.2.2 EBus DMA/TCR Registers Diagnostic
To start the DMA/TCR registers diagnostic, type
1
at the OBDiag menu prompt. The
EBus DMA/TCR registers diagnostic performs the following:
1.
dma_reg_test
– Performs a walking-ones bit test for the control status register,
address register, and byte-count register of each channel. Verifies the control
status register is set properly.
2.
dma_func-test
– Validates the DMA capabilities and FIFOs. The test is executed
in a DMA diagnostic loopback mode. Initializes the data of transmitting memory
with its address, performs a DMA read and write, and verifies that the data
received is correct. Repeats for four channels.
The following code example shows the EBus DMA/TCR registers output message.
4.7.2.3 Ethernet Diagnostic
To start the Ethernet diagnostic, type
2
at the OBDiag menu prompt. The Ethernet
diagnostic performs the following:
1.
my_channel_reset
– Resets the Ethernet channel.
2.
hme_reg_test
– Performs a walk-one test on the following registers set: global
register 1, global register 2, bmac xif register, bmac tx register, and mif register.
3.
MAC_internal_loopback_test
– Performs an Ethernet channel engine internal
loopback test.
4.
10_mb_xcvr_loopback_test
– Enables the 10Base-T data present at the
transmit MII data inputs, to be routed back to the receive MII data outputs.
5.
100_mb_phy_loopback_test
– Enables MII transmit data to be routed to the
MII receive data path.
6.
100_mb_twister_loopback_test
– Forces the twisted-pair transceiver into
loopback mode.
CODE EXAMPLE 4-9
EBus DMA/TCR Registers Output Message
Enter (0-12 tests, 13 -Quit, 14 -Menu) ===> 1
TEST='all_dma/ebus_test'
SUBTEST='dma_reg_test'
SUBTEST='dma_func_test'
Enter (0-12 tests, 13 -Quit, 14 -Menu) ===>