On Tue, May 07, 2013 at 11:33:24AM +0200, Jean-Christophe PLAGNIOL-VILLARD wrote: > On 23:03 Mon 06 May , Thomas Petazzoni wrote: > > Dear Sascha Hauer, > > > > On Mon, 6 May 2013 22:56:31 +0200, Sascha Hauer wrote: > > > > > > > Barebox update will generate the correct image for the storagemedia at > > > > > runtime > > > > > > > > What is "Barebox update" ? > > > > > > barebox_update is a command that you can call during runtime to update > > > barebox. Over writing images directly to the storage it has the > > > advantage that you can do additional sanity checks on the images. > > > > > > Also for example on i.MX a board specific poke table is all you need > > > to bring up SDRAM. As long as you have this poke table and a devicetree > > > you could use the same binary on different boards. > > > > Ok, makes sense. On Marvell Kirkwood, the SDRAM bring up is also done > > using a set of (address, value) pairs that are part of the image > > header. This mechanism is also available for Armada 370/XP, but > > apparently, DDR3 requires a more dynamic tuning to find optimal > > timings, so having static values in a table is no longer appropriate. > > > > In our case, how would barebox_update work? Would it overwrite just the > > barebox.bin payload (which would require updating the 32 bits checksum > > and the payload size in the header, otherwise the Marvell SoC would not > > boot the image at the next reboot), or should it overwrite the whole > > image (in which case it would have to re-extract the configuration and > > the binary blob, and reconstruct the image at runtime) ? Probably the > > first solution is the easiest one. > > yes you need to construct the image at *runtime* and drop this madness of 1 > image per media to generate. As this will create 1 defconfig per target device > > which duplicate the defconfig and make the maintainance a nightmare That's the way we currently do it. Don't expect from Thomas to do it differently as long there is not even a single example in the tree how to do it. Sascha -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
