On Fri, Aug 23, 2013 at 04:49:55PM +0800, Dong Aisheng wrote: > On Fri, Aug 23, 2013 at 03:51:07PM +0800, Shawn Guo wrote: > > The device tree mailing list is changed to devicetree@xxxxxxxxxxxxxxx. > > > > On Fri, Aug 23, 2013 at 03:09:08PM +0800, Dong Aisheng wrote: > > > I tried the uboot way with fdt command to change the node status, it can work. > > > However, it seems using fdt command is much complicated than the way i did with kernel > > > command line and it also does not support enable/disable multi nodes at the same time. > > > e.g, in order to enable ecspi1 and uart3 and disable gpmi: > > > with uboot fdt command: > > > U-Boot > fdt addr ${dtbaddr} > > > U-Boot > fdt set /soc/aips-bus@02000000/spba-bus@02000000/ecspi@02008000 status "okay" > > > U-Boot > fdt set /soc/aips-bus@02100000/serial@021e8000 status "okay" > > > U-Boot > fdt set /soc/gpmi-nand@00112000 status "disabled" > > > > Oh, you can use the U-Boot environment and scripting function to make > > it even easier than your kernel cmdline approach to use. > > > > Hmm? > Can you give an example to make it easier than kernel cmdline? For imx6q-sabreauto example, setenv loadaddr 0x12000000 setenv fdtaddr 0x18000000 setenv fdt_file imx6q-sabreauto.dtb setenv bootcmd 'tftpboot zImage; tftpboot ${fdtaddr} ${fdt_file}; fdt addr ${fdtaddr}; run select_${devsel}; bootz ${loadaddr} - ${fdtaddr}' setenv select_gpmi 'fdt set /soc/aips-bus@02000000/spba-bus@02000000/ecspi@02008000 status disabled; fdt set /soc/aips-bus@02100000/serial@021e8000 status disabled; fdt set /soc/gpmi-nand@00112000 status okay' setenv select_ecspi '...' setenv select_serial '...' You can have all above environments defined in U-Boot mx6qsabreauto.h at compile time. Then at runtime, you only need the following two commands to boot kernel with the device that you want. U-Boot > setenv devsel gpmi U-Boot > boot Shawn -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html