Artesyn ATCA-8310 Installation and Use (May 2014) - Manual (Page 173)

U-Boot
ATCA-8310 Installation and Use (6806800M72E) 173
6.2.1.4.2 Environment Variables Passed to the GPP
The SPP passes information to the GPP in the first 512 bytes of the FPGA shared memory area.
The format of this shared memory area is:
 Bytes 0/1 form the length code (Byte 0 is the lsb, byte 1 the msb)
 Bytes 2 .. +1 contains the parameter information. Parameters are passed as zero-
terminated = ASCII strings. The last parameter string is terminated with
two zero bytes.
 Bytes + 2 (lsb) and +3 (msb) contains the checksum over the parameter
information.
U-Boot initializes the parameter area with the following name/value pairs before releasing the
GPP from reset):
3 BIOS EnterSetup The BIOS setup menu has been entered.
4 BIOS PrepareToBoot XXX
15 BIOS Boot XXX
29 BIOS end XXX
>= 30 User defined OS run levels Can be used by the Operating system to report further
progress messages.
Table 6-4 GPP Run Levels (continued)
Value Mnemonic Description
Table 6-5 U-Boot Name/Value Pairs
Name Value (Corresponding U-Boot Variable) Description
btime $v_boottime Boot time of blade
slot_p $v_physical_slot Physical slot of blade
slot_l $v_logical_slot Logical slot of blade
shelf $v_shelf_id Shelf identifier
sname $v_shelf_name The name of the shelf stored in the shelf FRU
information (product area).
spnum $v_shelf_prid The product ID of the shelf