David, Am 25.04.2013 um 04:27 schrieb David Bagby <[email protected]>:
> Hi, > > I've been digging into the differences between the new Beaglebone Black > (BBB) and the original Beaglebone (white or BBW).In particular I've > beenreading the BB docs with an eye toward how the BBW->BBB changes may > impact the LCNC on BBW efforts. > > Recently Michael said that there would soon be a bootable SD image for > LCNC on a BB (I'm assuming that means a BBW since that's all that > existed until this week). > > I'm interested in extending LCNC from BBW to BBB and I've noticed a > couple of BBB differences that may impact the BBW LCNC stuff when > running on a BBB. > > My purpose in this email is to identify the topics I've notices and ask > what those of you deeper into the LCNC BBW effort think: > Are you aware of these, are they trivial to handle, or not, etc. ? > > BBB Kernel version requirement questions: > > The BBs ship with Angstrom by default; > > The BBW ships with Angstrom & a 3.2 kernel while the BBB ships running a > 3.8 kernel. > yes > I've been reading that 3.8 is a requirement for the BBB (I read that 3.8 > has device tree support which is apparently required for the AM3359 SoC > rev 2.0 silicon used by the BBB). not sure there is a connection here, but we'll see once we try The TI+reseller folks have been concentrating on getting things like cape support int 3.8 because 3.2 is dead (except for being a long-term release point) meaning if you can get by without the cape EEPROM support 3.2 shouldnt be an issue Bas probably can comment was is required here, but given the fact that Charles is using the BeBoPr on a 3.2 kernel it doesnt look it is > > My impression is that the LCNC BBW work as been done with Ubuntu 12.x > and thus kernel 3.2 -- is this correct? any linux distro with a decent package stream really, which excludes Angstrom re 3.2: yes, current kernel is 3.2.21 - the Xenomai patches for 3.8 are being worked on and I think a 3.8 based BB kernel should be become available during May > Has anyone done Ubuntu (12 or 13) with a 3.8 kernel + xenomai + LCNC on BBW? not me - no Xenomai 3.8 kernel as of yet, see Xenomai mailing list > Will the LCNC grand unified real time support (and desert topping?) > effort mean that the Xenomai work that has been done for BBW will just > run on BBB with a 3.8 (Ubuntu) kernel? If you refer to the unified binary support: all this means wrt the BB is that you can start linuxcnc on either a vanilla or Xenomai kernel, and it will work except for RT jitter > > Available Capes: > > I'm looking for a BB cape to use for trying out LCNC (on BBW). However > the only two that I know of don't appear to be available (BeBoPr and > Replicape). > > Are there any other capes you guys have been using that I should consider? > > BBW capes & BBB pin outs: > > I'm also getting the idea that those two capes may not run on a BBB > without at least some tweaks re pin use... > > The BBB added two key features which use up a significant # of pins > compared to the BBW: eMMC and HDMI. > > The eMMC support uses 10 pins on P8. > > The HDMI support uses 20 pins on P8. > > Between the two features, 30 pins of BBW P8 are not available on BBB (if > you want to use the corresponding BBB features). > > To figure out the implications of this, I started looking for the BBW > expansion connector pins the BeBoPr and Replicator use. As I was > searching for info, I read Charles' post today with his summary of pins > used by the two capes. > > Charles: Am I correct to assume that your LCNC stepgen PRU code is > configured to use the same BBW pins as the BeBoPr (I think I remember > reading that you were using that for prototyping)? > > If so, I suspect that we're going to find that there are some BBB pin > challenges to consider.A quick look at the BBB schematics shows that a > fair number of the pins in use by the BeBoPr and Replicape PRU > configurations overlap with the LCD/HDMI pin set on BBB P8. That implies > at least some changes will likely be needed to move LCNC from BBW to BBB > (with the current pin mappings, to run LCNC on a BBB I think it would be > necessary to disable the HDMI support in the BBB). > > Are these questions already figured out or do these topics still need to > be worked through? > > Dave > > ------------------------------------------------------------------------------ > Try New Relic Now & We'll Send You this Cool Shirt > New Relic is the only SaaS-based application performance monitoring service > that delivers powerful full stack analytics. Optimize and monitor your > browser, app, & servers with just a few lines of code. Try New Relic > and get this awesome Nerd Life shirt! http://p.sf.net/sfu/newrelic_d2d_apr > _______________________________________________ > Emc-developers mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-developers ------------------------------------------------------------------------------ Try New Relic Now & We'll Send You this Cool Shirt New Relic is the only SaaS-based application performance monitoring service that delivers powerful full stack analytics. Optimize and monitor your browser, app, & servers with just a few lines of code. Try New Relic and get this awesome Nerd Life shirt! http://p.sf.net/sfu/newrelic_d2d_apr _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
