* boot/i386/pc/lnxboot.S (data_start): Code cleanup. (real_code_2): Code cleanup and change comment style. (move_memory): Avoid using 32-bit address mode.
* conf/i386-pc.rmk (pkgdata_IMAGES): Add lnxboot.img. (lnxboot_img_SOURCES): New variable. (lnxboot_img_ASFLAGS): Likewise. (lnxboot_img_LDFLAGS): Likewise. * boot/i386/pc/lnxboot.S: New file.