Hello, Heesub Shin <heesub.shin@xxxxxxxxxxx> writes: >> 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. > > 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? That's probably because you have the big.LITTLE switcher enabled in your .config (which is the default when using exynos_defconfig). If you modify your .config and set CONFIG_BL_SWITCHER=n, you will see all 8 cores online. Kevin -- 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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