Hi, On 05/05/17 20:55, Jagan Teki wrote: > On Wed, Apr 26, 2017 at 6:02 AM, Andre Przywara <andre.przyw...@arm.com> > wrote: >> When a board uses a FIT image to load U-Boot proper, it requires a list >> of supported device trees to be supplied in CONFIG_OF_LIST, from which it >> chooses the right one at runtime. >> For boards with just one possible DT (like the OrangePi PC2) this >> defaults to CONFIG_DEFAULT_DEVICE_TREE, but for the Pine64 with its two >> possible models we provide all compatible DTs in this config symbol. >> >> Signed-off-by: Andre Przywara <andre.przyw...@arm.com> >> --- >> configs/pine64_plus_defconfig | 1 + >> 1 file changed, 1 insertion(+) >> >> diff --git a/configs/pine64_plus_defconfig b/configs/pine64_plus_defconfig >> index 92bda60..593e24a 100644 >> --- a/configs/pine64_plus_defconfig >> +++ b/configs/pine64_plus_defconfig >> @@ -3,6 +3,7 @@ CONFIG_ARCH_SUNXI=y >> CONFIG_MACH_SUN50I=y >> CONFIG_RESERVE_ALLWINNER_BOOT0_HEADER=y >> CONFIG_DEFAULT_DEVICE_TREE="sun50i-a64-pine64-plus" >> +CONFIG_OF_LIST="sun50i-a64-pine64 sun50i-a64-pine64-plus" > > fdtfile env is compile option now, so it all ways assign > CONFIG_DEFAULT_DEVICE_TREE so it can't pick sun50i-a64-pine64.dtb > here, are you manage this in runtime board code?
There may be a confusion about two different uses of DT: CONFIG_DEFAULT_DEVICE_TREE and CONFIG_OF_LIST are there to tell which DT U-Boot (proper) *itself* uses: and yes, we pick one of OF_LIST at runtime (based on some board-specific code, for instance 512MB RAM on the Pine64(non-plus). The "fdtfile" environment variable is to give a filename stub for loading an *external* DT for the *OS*. Eventually we hopefully won't need that variable and .dtb loading at all, instead we just pass U-Boot's DT ($fdtcontroladdr) on the OS. This removes the churn distributions have these days with having to provide .dtb files for each and every board they want to support. Cheers, Andre. _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot
