On Thu, Jan 14, 2016 at 09:54:24AM -0800, Stefan Agner wrote: > On 2016-01-14 09:15, Tom Rini wrote: > > On Wed, Jan 13, 2016 at 12:45:05PM -0800, Stefan Agner wrote: > >> Hi, > >> > >> I would like to keep the discussion going and shed some light on the > >> image format introduced here, see below... > >> > >> On 2016-01-07 00:38, Peng Fan wrote: > >> > Hi Stefan, > >> > On Wed, Jan 06, 2016 at 10:59:17PM -0800, Stefan Agner wrote: > >> >>On 2016-01-04 21:56, Peng Fan wrote: > >> >>> From: Peng Fan <peng....@nxp.com> > >> >>> > >> >>> To boot a auxiliary core in asymmetric multicore system, introduce the > >> >>> new command "bootaux" to do it. Example of boot auxliary core from > >> >>> 0x70000000 where stores the boot head information that should be > >> >>> parsed by auxiliary core, "bootaux 0x70000000". > >> >> > >> >>This reminds me of a question which was nagging me lately: > >> >>Is the M4 core of SoloX/MX7 running a boot ROM? Or who/what is "parsing > >> >>the boot head information"? > >> > > >> > There is no bootrom for m4 core. The bootimage for M4 contains stack > >> > info and pc info. bootaux command will use the info extracted from > >> > bootimage. > >> > >> > >> So the image expected by bootaux is really a raw binary image, with the > >> only notion that the first two words need to be the stack pointer and > >> the reset handler (firmware entry point). > >> > >> U-Boot has other commands which work with "raw" images, such as the > >> bootz command. The bootz command also expects a certain "raw" format, > >> hence I guess it is ok to introduce something like that also for the > >> auxiliary core. > > > > I suppose my only contribution right now is that for another project > > where we have U-Boot (on the M4) kicking off NuttX we've had to do a > > custom command to stack pointer thing, I agree with the need to add some > > way to easily kick these cases off. > > So the NuttX image was also kind of a raw image? Is that command > upstream?
The NuttX image is the "normal" raw cortex-m image format (everyone else just writes it to flash and boots directly). I haven't pushed the patches upstream as the rest of the platform also isn't ready to go upstream. -- Tom
signature.asc
Description: Digital signature
_______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
