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BIOS
C
HECKPOINTS
4-28
TCP reliability and HTTP load balancing. Moreover, unlike PXE only can get NBP from DHCP
server, HTTP boot has the ability to get NBP from remote HTTP server as long as right URL.
Figure 4-9.
HTTP BOOT Device in BIOS Setup Menu
Checkpoints
A checkpoint is either a byte or word value output to Debug port. The BIOS outputs check-
points throughout bootblock and Power-On Self Test (POST) to indicate the task the sys-
tem is currently executing. Checkpoints are very useful in aiding software developers or
technicians in debugging problems that occur during the pre-boot process.
Checkpoints can be defined as follow:
Standard Checkpoint
ACPI/ASL Checkpoint
OEM-Reserved Checkpoint
MRC POST Code Checkpoints
POST LED0(LSB)~LED3
Green On/Off
POST LED4~LED7(MSB)
Amber On/Off
LED0
LED7
LED1
LED2
LED3
LED4
LED5
LED6
MSB
LSB
Amber
Green
Summary of Contents for DS240
Page 97: ...Rail Kit Assembly Chapter 3 ...