IBM SY44-5902-05 manual Initial Program Load IPL Information, IPL type, mode, and speed options

Chapter 7. Initial Program Load (IPL) Information

IPL type, mode, and speed options	. 217		Abnormal ending	. 219
IPL speed recommendations	. 217		Licensed Internal Code (LIC) initialization. .	. 219
Methods to perform IPL	.	217	Functions performed	.	219
Alternate installation IPL	.	218	Abnormal ending	.	219
IPL sequence	.	218	Initialization output	.	220
Service processor initialization	.	218	Data descriptions	.	220
Functions performed	.	218	Log entries	.	220
What is initialized	.	218	Status SRCs	.	221

IPL type, mode, and speed options

Set the IPL options from function 02 on the control panel. To permanently change the IPL speed use the CHGIPLA command.

vUse function 01 to display the current IPL option, including IPL speed. This is the option and speed that the system will use at the next IPL. Refer to “Function 01–Display Selected IPL Type and Speed (on Systems with a Keystick)” on page 162 for more information about function 01.

vRefer to the information in Table 15 on page 159 for speed override definitions.

vUse the HDWDIAG (hardware diagnostics) parameter of the CHGIPLA command to permanently change the IPL speed. The values are: The default shipped value *MIN (minimal) for fast diagnostics and *ALL for all (full) diagnostics.

IPL speed recommendations

vUse CHGIPLA *MIN, or Function 02 F or V=F for most IPLs (to perform a fast IPL that uses minimum diagnostics).

vUse CHGIPLA *ALL, or Function 02 S or V=S, if you change hardware or suspect an intermittent hardware failure (to perform a slow IPL that uses all diagnostics).

vUse CHGIPLA *ALL, or Function 02 S or V=S during the first Install IPL. You can set this at the panel with Function 02; it affects only the one IPL because the next IPL will again pick up the value set with CHGIPLA.

For more information about:

vIPL types, see Table 13 on page 159

vIPL modes, see Table 14 on page 159

vIPL speeds, see Table 15 on page 159

vControl panel functions, see “Control panel function descriptions (Models 150, 170, 250, 4xx, 50x, 51x, 530, 53S, 6xx, 7xx, SB1, and Sxx)” on page 162 or the system operator information

Methods to perform IPL

Table 43. Methods to perform IPL

Methods	Description
POR	Power on reset IPL. The system was powered off and powered on. During the power on,
	all hardware runs diagnostic tests.

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