On 01/08/15 17:49, Sjoerd Simons wrote: > On Wed, 2015-01-07 at 23:49 +0000, Jonathan Stone -SISA wrote: >> >> On On Wed, 2015-01-07 at 18:37 +0000, Sjoerd Simons writes wrote: >>> On Wed, 2015-01-07 at 18:37 +0000, Anand Moon wrote:> >> [...] >> >>>> Only 4 core cpu's are on my board. Also CpuFreq is not working. >>> >>> Can you share some point on this. >> >>> The defconfig is using the bL switcher, which pairs up big and little cores to make them appear as one core.. So for 8 real cores, you'll get >>> 4 "virtual cores". >> >> That configuration is appropriate for the 5420, which allegedly has a hardware bug in the cache-coherence between the Cortex-A7 block and the Cortex-A15 block. >> Newer Exynos 5 SoCs -- 5422/5800, 5620, etc -- don't have that bug. The scheduler should configured to do HMP on all 8 (or 6) cores. >> I don't have a 5410, but I assume it has the same bug as the 5420. > > Yes the kernel/scheduler could be configured like that, but > exynos_defconfig turns on bL rather then HMP. > > Now it's not unthinkable to add code/dts properties to select the > right/preferred scheduling strategy depending on the board (HMP vs. bL). > But proper HMP scheduling is still a work in progress in mainline and > iirc specifically on the XU3 there are open issue wrt. MCPM and its > secure firmware. I've added Kevin to the CC as he's been working on this > topic so should know the status a lot better then i do. > >> The XU3 kernel supplied by HardKernel shows all 8 cores, and does HMP scheduling across all 8. > > Yes, that's independant of the dts though as mentioned above. Also there > are still opne issues to booting up all cores on an XU3 afaik. See > http://www.spinics.net/lists/linux-samsung-soc/msg39523.html > >> I tried v1.0 of the Odroid-XU3 DTB patch, applied to linux-next >> 20150107. I'm only seeing 1 core running on my Odroid-XU3. The USB >> 3.0 port works (great!) but I'm not getting any HDMI output. I didn't >> try DisplayPort. I'll gladly try v2 of the patch on an XU3; is there >> a better base to apply the patch to? > > HDMI output is broken on all exynos boards in mainline atm. For exynos > 5, see the thread here: > http://www.spinics.net/lists/linux-samsung-soc/msg40708.html > > As far as a i know with the DTS as posted (just posted v3 with a small > improvement), all base functionality that can work on mainline (MMC/SD, > network, USB2, USB3) works. Some less important bits (fan control & > power sensors) are outstanding, but that really shouldn't block the > merge of the DTS. > Sjoerd, thanks. I'll take your updated patch once you submit version3. - Kukjin -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
