[LinuxBIOS] LinuxBios on a braille display ?

Peter Stuge stuge-linuxbios at cdy.org
Sat Mar 3 03:17:48 CET 2007

The flash ROM chip is mounted on the mainboard either by being
soldered to the board, or by being placed in a socket.

Socketed chips can be removed/replaced with just a little physical
force, while soldered-on chips need to be desoldered somehow.

(Soldering is the process of connecting two metal objects using a
third metal that is melted in the joint and then hardened. Compare
welding which means the two metals themselves melt and then harden.)

When developing BIOS software the build/run cycle includes
reprogramming the flash ROM that the system boots from. During
development the BIOS will not allow the system to complete the boot
process and so the system will not be fully usable until the BIOS is
debugged. This means that the flash ROM must be reprogrammed in
another system, or that two flash ROMs can be switched between so
that the system can be started both with a known good BIOS and the
developing LinuxBIOS.

Being able to remove the flash ROM easily from the target system
simplifies development greatly. There's also a product called the
BIOS savior that enables simple switching between two flash ROMs,
it is designed to be mounted in a socket.

Bottom line: flash ROM in socket is a requirement for BIOS
development, otherwise you have only one try to get everything right,
which is unlikely to impossible.


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