IBM 8646 Hardware Maintenance Manual - Page 51

Flash ROM Jumper, Automatic BIOS Recovery ABR Jumper, Automatic Server Restart ASR

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Flash ROM Page Jumper Switch block Flash ROM page-swap jumper (J38) 123 Flash ROM page jumper (J38) determines whether primary or secondary (backup) POST/BIOS code is used by the system to start up. The default setting for J38 is a jumper between pins 2 and 3 (primary POST/BIOS). For backup POST/BIOS, place a jumper between pins 1 and 2 of J38. Normally this action is not required, but if the primary BIOS is damaged, and ABR is not functioning properly, the jumper can be moved for troubleshooting purposes. Changing the jumper position after system power-on is not permitted; it may cause unpredictable problems. Note: The BIOS Flash Update Utility always updates the primary BIOS. Automatic BIOS Recovery (ABR) Jumper The default setting for J20 is no jumper. If it is necessary to disable ABR during trouble shooting, install a jumper on J20. Automatic Server Restart (ASR) To enable Automatic Server Restart, a special device driver must be loaded. This device driver enables the ASR watch-dog timer and then periodically resets it (within 5 minutes). If not reset, the ASR watch-dog timer will expire and boot the system. The watch-dog timer will re-arm itself after being reset. To disable the ASR hardware, a jumper must be installed between pins 1 and 2 of J14. THe default is no jumper installed (ASR enabled). System board switch block The switch block contains microswitches 1 through 8. As pictured in this illustration, switch 8 is at the right of the switch block, and switch 1 is at the left. The following table describes the function for each switch. The default setting is Off for all switches in the switch block. Installing options 43

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Flash ROM Page Jumper
Flash ROM
page-swap
jumper (J38)
Switch block
1
2
3
Flash ROM page jumper (J38) determines whether primary or secondary (backup)
POST/BIOS code is used by the system to start up. The default setting for J38 is a
jumper between pins 2 and 3 (primary POST/BIOS). For backup POST/BIOS,
place a jumper between pins 1 and 2 of J38. Normally this action is not required,
but if the primary BIOS is damaged, and ABR is not functioning properly, the
jumper can be moved for troubleshooting purposes. Changing the jumper position
after system power-on is not permitted; it may cause unpredictable problems.
Note:
The BIOS Flash Update Utility always updates the primary BIOS.
Automatic BIOS Recovery (ABR) Jumper
The default setting for J20 is no jumper. If it is necessary to disable ABR during
trouble shooting, install a jumper on J20.
Automatic Server Restart (ASR)
To enable Automatic Server Restart, a special device driver must be loaded. This
device driver enables the ASR watch-dog timer and then periodically resets it
(within 5 minutes). If not reset, the ASR watch-dog timer will expire and boot the
system. The watch-dog timer will re-arm itself after being reset. To disable the ASR
hardware, a jumper must be installed between pins 1 and 2 of J14. THe default is
no jumper installed (ASR enabled).
System board switch block
The switch block contains microswitches 1 through 8. As pictured in this
illustration, switch 8 is at the right of the switch block, and switch 1 is at the left.
The following table describes the function for each switch. The default setting is
Off for all switches in the switch block.
Installing options
43