mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-21 02:33:07 +00:00
7d489128dc
Provide a man-page for the mtest command. Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
66 lines
1.8 KiB
ReStructuredText
66 lines
1.8 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0+
|
|
.. Copyright 2022, Heinrich Schuchardt <xypron.glpk@gmx.de>
|
|
|
|
mtest command
|
|
=============
|
|
|
|
Synopsis
|
|
--------
|
|
|
|
::
|
|
|
|
mtest [start [end [pattern [iterations]]]]
|
|
|
|
Description
|
|
-----------
|
|
|
|
The *mtest* command tests the random access memory. It writes long values, reads
|
|
them back and checks for differences. The test can be interrupted with CTRL+C.
|
|
|
|
The default test uses *pattern* as first value to be written and varies it
|
|
between memory addresses.
|
|
|
|
An alternative test can be selected with CONFIG_SYS_ALT_MEMTEST=y. It uses
|
|
multiple hard coded bit patterns.
|
|
|
|
With CONFIGSYS_ALT_MEMTEST_BITFLIP=y a further test is executed. It writes long
|
|
values offset by half the size of long and checks if writing to the one address
|
|
causes bit flips at the other address.
|
|
|
|
start
|
|
start address of the memory range tested, defaults to
|
|
CONFIG_SYS_MEMTEST_START
|
|
|
|
end
|
|
end address of the memory range tested, defaults to
|
|
CONFIG_SYS_MEMTEST_END. If CONFIGSYS_ALT_MEMTEST_BITFLIP=y, a value will
|
|
be written to this address. Otherwise it is excluded from the range.
|
|
|
|
pattern
|
|
pattern to be written to memory. This is a 64bit value on 64bit systems
|
|
and a 32bit value on 32bit systems. It defaults to 0. The value is
|
|
ignored if CONFIG_SYS_ALT_MEMTEST=y.
|
|
|
|
iterations
|
|
number of test repetitions. If the value is not provided the test will
|
|
not terminate automatically. Enter CTRL+C instead.
|
|
|
|
Examples
|
|
--------
|
|
|
|
::
|
|
|
|
=> mtest 1000 2000 0x55aa55aa55aa55aa 10
|
|
Testing 00001000 ... 00002000:
|
|
Pattern AA55AA55AA55AA55 Writing... Reading...
|
|
Tested 16 iteration(s) with 0 errors.
|
|
|
|
Configuration
|
|
-------------
|
|
|
|
The mtest command is enabled by CONFIG_CMD_MEMTEST=y.
|
|
|
|
Return value
|
|
------------
|
|
|
|
The return value $? is 0 (true) if the command succeeds, 1 (false) otherwise.
|