Kevin Hilman <khilman <at> kernel.org> writes: > > From: Kevin Hilman <khilman <at> linaro.org> > > Using the current exynos_defconfig on the exynos5422-odroid-xu3, only > 6 of 8 CPUs come online with MCPM boot. CPU0 is an A7, CPUs 1-4 are > A15s and CPU5-7 are the other A7s, but with the current code, CPUs 5 > and 7 do not boot: > > [...] > Exynos MCPM support installed > CPU1: update cpu_capacity 1535 > CPU1: thread -1, cpu 0, socket 0, mpidr 80000000 > CPU2: update cpu_capacity 1535 > CPU2: thread -1, cpu 1, socket 0, mpidr 80000001 > CPU3: update cpu_capacity 1535 > CPU3: thread -1, cpu 2, socket 0, mpidr 80000002 > CPU4: update cpu_capacity 1535 > CPU4: thread -1, cpu 3, socket 0, mpidr 80000003 > CPU5: failed to come online > CPU6: update cpu_capacity 448 > CPU6: thread -1, cpu 2, socket 1, mpidr 80000102 > CPU7: failed to come online > Brought up 6 CPUs > CPU: WARNING: CPU(s) started in wrong/inconsistent modes > (primary CPU mode 0x13) > CPU: This may indicate a broken bootloader or firmware. > > Thanks to a tip from Abhilash, this patch gets all 8 CPUs booting > again, but the warning about CPUs started in inconsistent modes > remains. Also, not being terribly familiar with Exynos internals, > it's not at all obvious to me why this register write (done for *all* > secondaries) makes things work works for the 2 secondary CPUs that > didn't come online. It's also not obvious whether this is the right > general fix, since it doesn't seem to be needed on other 542x or 5800 > platforms. Hi, Very interesting to see your post. I was also suffering from the same problem with my Odroid-XU3 board. With your patch 8 CPUs are brought up, but Cortex-A15 CPUs are always offline, showing low performance. heesub@odroid:~$ cat /sys/devices/system/cpu/online 0,5-7 heesub@odroid:~$ cat /sys/devices/system/cpu/offline 1-4 Any suggestion? Thanks a lot!! Heesub -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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