Emerson PMPPC7448 user manual Monitor: Basic Operation, Power-up/ResetSequence

Monitor: Basic Operation

Figure 11-1:Example Monitor Start-up Display

	U-Boot	0.4.0 (Jul 30 2007 - 10:57:37)1.8
Hardware initialization	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

Monitor command prompt	Hit any key to stop autoboot: 0
	PM/PPC-7448(1.8)=>

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. 11-2before 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 11-2for 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. 11-2for the LED pattern at the various initialization steps.

11-2

PmPPC7448 User’s Manual 10006757-02