Now I have this
$this->bbcode_second_pass_code('', '
[(2015-01-24) root@serviedre boot]# cat boot.txt
part uuid ${devtype} ${devnum}:${bootpart} uuid
setenv bootargs console=${console} root=/dev/sda1 rw rootwait elevator=noop ethaddr=00:CE:39:B7:74:4E rootfstype=ext4
if load ${devtype} ${devnum}:${bootpart} ${kernel_addr_r} /boot/zImage; then
if load ${devtype} ${devnum}:${bootpart} ${fdt_addr_r} /boot/dtbs/${fdtfile}; then
if load ${devtype} ${devnum}:${bootpart} ${ramdisk_addr_r} /boot/initramfs-linux.img; then
bootz ${kernel_addr_r} ${ramdisk_addr_r}:${filesize} ${fdt_addr_r};
else
bootz ${kernel_addr_r} - ${fdt_addr_r};
fi;
fi;
fi
if load ${devtype} ${devnum}:${bootpart} 0x48000000 /boot/uImage; then
if load ${devtype} ${devnum}:${bootpart} 0x43000000 /boot/script.bin; then
setenv bootm_boot_mode sec;
bootm 0x48000000;
fi;
fi
')
boot.txt but I prefer to having more elegant one specifying that $uuid is the UUID of the /dev/sda1. How can I achieve it?