Kontron AT8402 Diagnostics Manual - Manual (Page 28)

Diagnostics running on the Carrier AT8402
Page 2 - 20 AT8402 CLI Reference Manual
Description
This tests reads all images and data stored on the on-board flash and checks the
embedded checksums.
Failure impact
•
PPC-00060007 diagnostic code results from an flash read error. The impact is loss
of applications running on carrier host processor if the active images and/or config-
urations are corrupted. This impacts at least Ethernet functionality and command
line interface.
2.7.8 PPC_FLASH_RW
Flash read/write test. This test can be run automatically. The test script is executed on
the SUT.
Test group:
Diagnostics
Test case: ppc
Test procedure: PPC_FLASH_RW
Test host:
Carrier
Test IC: full
Test mode: destructive
Diagnostic code: PPC-00060008
Description
This test is used to check if the flash is attached properly to the PPC405 external bus
controller. Similar to SDRAM tests, a data and address bus check is performed. It has
been taken into concern, that single flash bits can only be changed from ‘1’ to ‘0’ and
that changing a flash bit from ‘0’ to ‘1’ requires erasing of a complete flash sector (all
bits in this sector are changed from ‘0’ to ‘1’.
The test uses the ppc-flash utility which is based on the linux MTD layer and is thus
running from linux user space. The utility provides 4 basic modes to test flash sectors:
erase: This mode allows erasing flash sectors in a given MTD partition. To erase
sectors, ppc-flash is called with the following syntax:
ppc-flash erase MTD-DEV startaddr endaddr
fill: This mode allows writing a testpattern into the sectors of a given MTD partition. It
is important to note that the flash sector is checked to be erased before writing the
testpattern. This way can ensure, that address errors are detected because the resulting
overlapping address ranges will lead to sectors already written during filling procedure.
The syntax to fill sectors is the same as for erasing:
ppc-flash fill MTD-DEV startaddr endaddr
compare: This mode allows comparing the sector contents of a given MTD partition
with the testpattern written before. The syntax is as follows:
ppc-flash comp MTD-DEV startaddr endaddr
test: This mode allows testing if the flash sectors of a given MTD partition are empty
or not. Syntax is the same as for compare:
ppc-flash test MTD-DEV startaddr endaddr