On Tue, Aug 20, 2019 at 09:14:41PM -0700, Troy Benjegerdes wrote: > > > > On Aug 13, 2019, at 8:47 AM, Christoph Hellwig <h...@lst.de> wrote: > > > > No point in bloating the kernel image with a bootloader header if > > we run bare metal. > > I would say the same for S-mode. EFI booting should be an option, not > a requirement. I have M-mode U-boot working with bootelf to start BBL, > and at some point, I’m hoping we can have a M-mode linux kernel be > the SBI provider for S-mode kernels, which seem most logical to me > to start using the vmlinux elf binaries using something like kexec()
Strictly speaking we could just add another option for the header so that you could also disable it for S-mode. But then again the header is not very harmful, as you don't have to use it. It just eats up a little more kernel space. And as that aspace is very tight for my M-mode target (the Kendryte KD210) and it is totally pointless for M-mode I just remove it there. The idea of using M-mode Linux as the SBI sounds cool.
