boot-time device tree overlays with U-Boot
part uuid ${devtype} ${devnum}:${bootpart} uuid | |
setenv bootargs console=${console} root=PARTUUID=${uuid} rw rootwait | |
if load ${devtype} ${devnum}:${bootpart} ${kernel_addr_r} /boot/zImage; then | |
if load ${devtype} ${devnum}:${bootpart} ${fdt_addr_r} /boot/dtbs/${fdtfile}; then | |
fdt addr ${fdt_addr_r} | |
fdt resize | |
setexpr fdtovaddr ${fdt_addr_r} + F000 | |
if load ${devtype} ${devnum}:${bootpart} ${fdtovaddr} /boot/dtbs/overlay.txt && env import -t ${fdtovaddr} ${filesize} && test -n ${overlay}; then | |
echo loaded overlay.txt: ${overlay} | |
for ov in ${overlay}; do | |
echo overlaying ${ov}... | |
load ${devtype} ${devnum}:${bootpart} ${fdtovaddr} /boot/dtbs/${ov}.dtb && fdt apply ${fdtovaddr} | |
done | |
fi | |
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 |
/dts-v1/; | |
/plugin/; | |
/ { | |
compatible = "allwinner,sun7i-a20"; | |
fragment@0 { | |
target = <&i2c2>; | |
__overlay__ { | |
#address-cells = <1>; | |
#size-cells = <0>; | |
ina219@40 { | |
status = "okay"; | |
compatible = "ti,ina219"; | |
reg = <0x40>; | |
shunt-resistor = <100000>; // R100 | |
}; | |
}; | |
}; | |
}; |
overlay=abc ina219 |
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