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Functional Description
MVME2500 Installation and Use (6806800L01H)
78
4.20 Debugging Support
The following information shows the details of Emerson debugging support as applied to the
MVME2500.
4.20.1 POST Code Indicator
The following table shows the LED status of the POST Codes. For the location of the POST Code
LEDs, see Onboard LEDs, on page 39.
Logic 1 means LED is "ON", Logic 2 means LED is "OFF"
4.20.2 JTAG Chain and Board
The MVME2500 is designed to work with separate JTAG board rather than with an onboard
JTAG multiplexer. The chip can support up to a 6-scan port and the board’s boundary scan
requires the following to function: ASSET hardware, JTAG board and JTAG cable. The
MVME2500 provides a 60-pin header that can connect to the JTAG board using a custom cable.
Table 4-3 POST Code Indicator on the LED
Sequence D33 D32 D35 Description
1 000U-boot has been copied from SPI flash to CPU cache.
2 010Serial console has been initialized, some text is visible
on the terminal.
3 0 1 1 DDR has been initialized using SPD parameters,
Execution is still in the cache.
4 100Execution has been relocated to RAM.
5 101PCI has been initialized.
6 110POST routines are finished.
7 111Additional SW routines are finished.
8 000U-boot prompt is visible on the terminal, can start
loading OS image from USB, Ethernet, SATA SSD, SD.