On Thu, May 17, 2018 at 2:48 PM, Peter Robinson pbrobinson@gmail.com wrote:
Hi,
I'm currently working on snapdragon bootloader support and in the particular case where U-boot is running in Aarch32 and the kernel is Aarch64 the specific implementation is to jump to Linux through SCM call.
I seem to remember the Allwinner A64 Pine64 starts in 32 bit mode and switches too so you might get some ideas from there or the maintainer might have some suggestions.
Hi Peter. Thanks for the tip.
I looked at the code, it appears that the Pine64 starts in 32bit SPL and jumps to U-boot in 64bit mode. This is done in a way which is not compatible with Snapdragons. Although it's possible to implement Snapdragon with SPL, but I think it's an overhead and I generally prefer just to run U-boot completely in 32bit mode.
Thanks, Ramon.
I try to find the best possible way to provide an alternative boot function. Adding #ifdef ARCH_SNAPDRAGON will just be too specific in arm/lib/bootm.c in my opinion and I'm thinking of introducing kind of a callback function in gd. that if exists will jump there instead of executing boot_jump_linux().
What do you think ?
Waiting for your thoughts on the subject.
Warm regards, Ramon. _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot