Artesyn ATCA-8310 Installation and Use (May 2014) - Manual (Page 172)

U-Boot
ATCA-8310 Installation and Use (6806800M72E) 172
U-Boot will check whether the GPP is in reset at startup. If this is the case, then:
 The shared memory area in the FPGA is set up
 The GPP is taken out of reset
 u-boot waits until the GPP BIOS indicates "Runlevel 0 reached"
The "gpp" command can be used to control the gpp. It accepts the following options:
 start []
Starts the GPP if it's in reset, waits until a runlevel > is reached. Aborts after
seconds (default is 20).
 restart
Same as start, but a GPP reset is enforced.
 init
initializes the shared memory parameter area.
 runlevel
Shows the current GPP runlevel
 port80
Shows the last port-80 code written by the GPP BIOS.
 show
Shows the current GPP status
 set []
Adds, removes or changes a parameter in the shared memory area.
6.2.1.4.1 GPP Run Levels
The GPP BIOS reports its boot progress via run level codes stored in mailbox register 0 of the
glue logic FPGA. The following run levels are defined:
Table 6-4 GPP Run Levels
Value Mnemonic Description
0 BIOS PEI XXX
1 BIOS DXE XXX
2 BIOS WaitSetup XXX