Hi Alex, Just a quick remarque that intrigued me:
Le jeu. 25 nov. 2021 à 15:57, Alex G. <mr.nuke...@gmail.com> a écrit : > > On 11/25/21 1:07 AM, Chan Kim wrote: > > Hello all, > > > > I'm trying to implement falcon mode for our board. Then should I first > > implement the normal mode(spl + proper)? > > > > It looks like so while I'm reading doc/README.falcon. (It says, after > > loading kernel, DT etc. I should give 'spl export' command). > > > > Falcon mode is a bit board dependent. There are a couple of ways you > could go about this. > > The first is to have an "fdtargs" partition. This is where "spl export" > comes in. Once you run "spl export", it will give a modified dtb at > "$fdtargsaddr". It's that DTB that you need to write to your ftdargs > partition. For example: > > > spl export fdt $loadaddr - $fdt_addr_r > > mmc write $fdtargsaddr 0x9800 0x8000 > > In this example the ftdargs partition starts at sector 0x9800, and is > 0x800 sectors long. > > > The second option is to forget about "spl export" and "fdtargs", and > package your kernel, devicetree, and overlays in a FIT container. You'd > make sure to enable SPL_LOAD_FIT_APPLY_OVERLAY. There isn't much more to > this other than the usual gotcha's with FIT and overlays. > Do you mean by this that the SPL has the capability to generate the "fdtargs" by it self (if we provide it with the dtb in the fitImage) ? Form my last experience with the falcon mode, I had a - not sure - conclusion that the only way to generate the "fdtargs" is by using the "spl export" command from uboot cmdline ! because the reality of the fdtargs blob, as its name indicates, is not just the fdt but it has also the bootargs (inside the chosen node ) that are required by the kernel. So if you give only the DTB to the SPL it will not work - to my knowledge -, cuz the data that will be passed to the kernel needs to contain also the bootargs ! Can you please confirm to me if this capability is implemented on the SPL and that we can actually forget about the "spl export" command ? Thanks And apologies Chan for jumping on your thread, Best regards, -- Abder
