Hi, * Tabi Timur-B04825 <b04...@freescale.com> [121105 13:42]: > On Mon, Nov 5, 2012 at 2:40 PM, Grant Likely <grant.lik...@secretlab.ca> > wrote: > > > Jane is building custom BeagleBone expansion boards called 'capes'. She > > can boot the system with a stock BeagleBoard device tree, but additional > > data is needed before a cape can be used. She could replace the FDT file > > used by U-Boot with one that contains the extra data, but she uses the > > same Linux system image regardless of the cape, and it is inconvenient > > to have to select a different device tree at boot time depending on the > > cape. > > What's wrong with having the boot loader detect the presence of the > Cape and update the device tree accordingly? We do this all the time > in U-Boot. Doing stuff like reading EEPROMs and testing for the > presence of hardware is easier in U-Boot than in Linux. > > For configurations that can be determined by the boot loader, I'm not > sure overlays are practical.
I guess the beaglebone capes could be stackable and hotpluggable if handled carefully enough. Regards, Tony _______________________________________________ devicetree-discuss mailing list devicetree-discuss@lists.ozlabs.org https://lists.ozlabs.org/listinfo/devicetree-discuss
