CURTISS-WRIGHT 1
826448 VERSION 5 MARCH 2015 PROPRIETARY C-3
BIOS SPI FLASH WRITE PROTECTION
Upon boot, the BIOS attempts to write to certain blocks of its Boot Flash, per normal BIOS
boot algorithms. When write-protected, the BIOS still attempts these writes to memory. When
read-backs show the write is unsuccessful, the BIOS continues to attempt further writes.
Eventually, the process will time out and the BIOS boot continues. Boot time increases by tens
of seconds when the Boot Flash is fully write-protected.
If the BIOS had not previously booted, for instance, when the BIOS Flash has been
reprogrammed, the BIOS will not complete the boot process with the Hardware Write-Protect
jumper in place. Ensure the Hardware Write-Protect jumper is not installed during the first
boot after BIOS Flash reprogramming.
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