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MVME55006E Single-Board Computer Installation and Use (6806800A37D)
Hardware Preparation and Installation Safe Start ENV Switch (S5-1)
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1.6.5 Safe Start ENV Switch (S5-1)
This switch selects programmed or safe start ENV settings. When set to OFF, it indicates that
the programmed ENV settings should be used during boot. Set to ON indicates that the safe
ENV settings should be used.
1.6.6 Flash 0 Block Write Protect Switch (S3-2)
This switch supports the Intel J3 Flash family write protect feature. Set to OFF, it enables the
lock-down mechanism. Blocks locked down cannot be unlocked with the unlock command. The
switch must be set to ON in order to override the lock-down function and enable blocks to be
erased or programmed through software. Refer to the Intel J3 Flash data sheet, listed in
Appendix C, Related Documentation, for further details.
Figure 1-7 S5-1 Settings
(factory configuration)
Normal ENV settings used
during boot
Safe ENV settings used
during boot
1
ON
1
ON
2
2
S5-1
Figure 1-8 S3-2 Settings
Disable Flash 0 J3
(factory configuration)
block writes
Enable Flash 0 J3
block writes
S3-2
1
ON
2
3
4
1
ON
2
3
4