Coreboot at Your Service!
Listing 7. Configuration for Bayou Payload
<BayouConfig> <global> <timeout>5</timeout> </global> <payloads> <payload type="chooser" flags="default"> <file>payloads/filo.elf</file> </payload> <payload type="chooser"> <file>payloads/coreinfo.elf</file> </payload> <payload type="chooser" flags="default"> <file>payloads/tint.elf</file> </payload> </payloads> </BayouConfig>
The config file is fairly straightforward. The default payload starts after five seconds, and if nothing is chosen, the default is FILO. The other options are tint or coreinfo (Figure 4 shows it running in QEMU).
Next, make a directory for the payloads, put them into it, and then run make:
$ ls -l payloads -rwxr-xr-x 1 ab users 47004 2009-01-03 11:59 coreinfo.elf -rwxr-xr-x 1 ab users 71440 2009-01-09 21:35 filo.elf -rwxr-xr-x 1 ab users 49298 2009-01-10 09:40 tint.elf -rwxr-xr-x 1 ab users 74334 2009-01-10 19:22 seabios.elf $ make
Now, run image in QEMU, and you can play Tetris from the BIOS (Figure 5).
Coreboot allows you to replace your motherboard's proprietary BIOS with a free and open-source BIOS. Coreboot already can boot Windows XP and Windows Vista as well as FreeBSD, Plan9 and, of course, Linux. Operating systems can be started from local disks, from a network connection or even from a serial port. Although it's not yet feature-complete, coreboot provides a base for building more flexible BIOSes.
Anton Borisov lives and works in Russia. Always fond of low-level programming, he has devoted his PhD work to the economic analysis of the advantages and ROI of custom-made firmware.
Special Reports: DevOps
Have projects in development that need help? Have a great development operation in place that can ALWAYS be better? Regardless of where you are in your DevOps process, Linux Journal can help!
With deep focus on Collaborative Development, Continuous Testing and Release & Deployment, we offer here the DEFINITIVE DevOps for Dummies, a mobile Application Development Primer, advice & help from the experts, plus a host of other books, videos, podcasts and more. All free with a quick, one-time registration. Start browsing now...