Hi Simon, Simon Glass <s...@chromium.org> writes:
> On 8 December 2014 at 10:58, Kevin Hilman <khil...@kernel.org> wrote: [...] >> FWIW, the XU3 firmware is broken in other ways as well which have a >> major impact on power management. >> >> First, with mainline kernels using MCPM, only 6 of 8 CPUs come >> online. However, even with that fixed[1], it turns out that the kernel >> can't properly manage CCI due to secure firmware[2], which means that MCPM >> (multi-cluster power management) can't work, and thus the low-power >> cluster-idle states can't work, the big.LITTLE switcher cannot work, and >> the ongoing work on energy-aware scheduling will not be useful on this >> platform. >> >> Anyone know what are the chances of getting a non-secure version of the >> firmware for this platform. The Samsung Chromebook2 with basically the >> same SoC (5800 compared to the 5422 on the XU3) ships with non-secure >> firmware so all of the above mentioned features are working just fine. > > I have pushed on this but apparently it is not possible - they need to > sign every BL2. The only implementation I've seen sets up the chip in > BL2 (U-Boot SPL) so I don't think we can work around it. Not quite sure I'm following... So is secure-mode enabled before BL2 is started? Or do you mean BL2 is where secure-mode is enabled? If it's done in BL2, and if the hardkernel folks are willing to sign BL2 images (which I gathered from discussions elsewhere in this series) then it seems possible to turn off secure-mode. So I went to look in the u-boot-samsung repo and didn't see the code for the SPL there. Is the BL2 source (which I understood to be u-boot SPL) in some other repo? > It takes us back to the 1960s where we sent off our code at night to > run it :-) > > I think the best bet is the current effort to mainline the rest of the > Chromebook code then try to build it for XU3. What's the status of that effort? >> >> I'm working on getting these same features working on the XU3, but this >> broken firmware as brought a halt to any real progress. > > Agreed, but I think this is feasible once U-Boot on XU3 is sorted out. Let's hope so. Kevin _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
