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Monitor: Basic Operation
PmPPC7448 User’s Manual 10006757-02
11-2
Figure 11-1: Example Monitor Start-up Display
BASIC OPERATION
The PmPPC7448 monitor performs various configuration tasks upon power-up or reset.
This section describes the monitor operation during initialization of the PmPPC7448 board.
The flowchart (see
Fig. 11-2) illustrates the power-up and global reset sequence (bold text
indicates environment variables).
Power-up/Reset Sequence
The PmPPC7448 monitor follows the boot sequence in Fig. 11-2 before auto-booting the
operating system or application software. At power-up or board reset, the monitor per-
forms hardware initialization, diagnostic routines, autoboot procedures, free memory ini-
tialization, and if necessary, invokes the command-line. Note that the U-Boot monitor has
the ability to timeout while waiting for EREADY. See
Table 11-2 for default configuration set-
tings.
Prior to the console port being available, the monitor will display a four-bit hexadecimal
value on LED1 through LED4 to indicate the power-up status. In the event of a specific ini-
tialization error, the LED pattern will be displayed and the board initialization will halt. Refer
to
Fig. 11-2 for the LED pattern at the various initialization steps.
Hardware initialization
Monitor command prompt
U-Boot 0.4.0 (Jul 30 2007 - 10:57:37)1.8
CPU: MPC7448 v2.1 @ 1399.999 MHz
Board: PM/PPC-7448
BusHz: 133333333
I2C: ready
DRAM: DDR SDRAM in slot 0 DDR SDRAM in slot 1 ECC (Clearing..)
2048 MB
FLASH: [32MB@e8000000] 32 MB
PCI: Bus Host
Waiting For EREADY ('q' to exit w/o enum).
Diags Mem: PASSED
Diags I2C: PASSED
Diags Flash: PASSED
Ser#: 1264
Mon: Resides 0x80000000 - 0x7ff2d9c0
BtDev: Socketed Flash
DCach: on (WriteThrough)
ICach: on
L2Che: on (WriteThrough)
Net: portdbg, porta, portb
Hit any key to stop autoboot: 0
PM/PPC-7448(1.8)=>