U-Boot
ATCA-F125 (6873M Artwork) Installation and Use (6806800J94N)
109
5.8.2
Controlling the Execution of the POST
The environment variable
post_control
allows to configure when POST is executed.
Possible values of
post_control
and their meaning are described in the following table.
You can start the POST execution manually by invoking the following command at the U-
Boot command line interface:
.post_all()
As you can see from the syntax, this command invokes an underlying C function which
starts the POST execution. This command can be invoked at any time and it is independent
of the environment variable post_enable.
MDIO/PHY
Attempts to read model and device ID from PHY address 0..3
TSEC network port
The PHY for each TSEC port is configured to loop back mode, 100 and
1000 MBPS, and 10000 loop back packets are sent and verified.
Boot flash
Flash devices are sent into CFI query mode and the query string is
verified.
RTM
Check connectivity of 10G repeater devices on RTM
Table 5-6
POST Routines (continued)
Device
Description
Table 5-7
Environment Variable post_control
Value
Description
off
Disables POST altogether
always
POST is executed after all types of blade resets
hard
POST is executed only after hard resets. A hard reset is a reset of
the entire payload and can be issued by the following reset sources:
Watchdog inside CPU
Boot sequence failure
Software
Face plate reset key
A hard reset is NOT an CPU internal reset, such as a reset issued
through the U-Boot command
reset
or the Linux command
reboot.
