Firebird builds on both ARM and ARMEL
From this table you can see that firebird builds on both ARM and ARMEL ( ARMEL is just ARM with some hardware extras.) and here is the buildlog
If you use debian then you can download from here
Quote from linux tiny mailing list about the ARM market share
According to http://eetimes.eu/showArticle.jhtml?articleID=199702110
Arm shipped the processors in 250 million “smart phones” in 2006 (83%
market share in that niche). Read more