Hi Geert,
Thanks for your reply!
On 09/29/2016 10:40 PM, Geert Uytterhoeven wrote:
Hi Hiep,
On Thu, Sep 29, 2016 at 1:03 PM, Hiep Cao Minh <cm-hiep@xxxxxxxxxxx> wrote:
I'd like to report the issue of the CPU operation.
We tested and found it on Lager board at linux-v4.8-rcx.
The test procedure is the following:
Confirmation command:
# cat /proc/interrupts
CPU0
19: 2509 GIC-0 27 Level arch_timer
21: 0 GIC-0 36 Level e6050000.gpio
22: 0 GIC-0 37 Level e6051000.gpio
23: 0 GIC-0 38 Level e6052000.gpio
24: 0 GIC-0 39 Level e6053000.gpio
25: 0 GIC-0 40 Level e6054000.gpio
26: 0 GIC-0 41 Level e6055000.gpio
27: 23 GIC-0 101 Level e61f0000.thermal
…”
This issue appears when we changed the SW8-PIN4 of Lager board.
SW8-PIN4: ON
+ At linux-v4.7: OK (4 cores work together normally).
+ At linux-v4.8-rc2: OK (4 cores work together normally).
SW8-PIN4: OFF
+ At linux-v4.7: -> OK(4 cores work together normally).
+ At linux-v4.8-rc2: -> NG(Only 1 core works).
And the kernel prints "Unable to boot CPU%u when MD21 is set", right?
We tried to find out the issued patch and we realize that it happens from
the following patch:
" 043248c Merge tag 'armsoc-dt' of
git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc"
The issue you're seeing is due to a combination of commits 5f3bca0db8ac01a7
("ARM: shmobile: apmu: Add APMU DT support via Enable method") and
dc378795156d980c ("ARM: dts: r8a7790: Add APMU nodes").
When debug mode is enabled (SW8-4 = OFF), trying to boot secondary CPUs may
lock up the system after a cold boot, depending of boot load version. Hence
we explicitly prohibit that. BTW, this has been the case on Koelsch since commit
277efd30cfc72ec2 ("ARM: shmobile: Check r8a7791 MD21 at SMP boot").
Now, does series "[PATCH/RFT 0/4] ARM: shmobile: R-Car Gen2: Allow booting
secondary CPU cores in debug mode" (included in all renesas-drivers releases
during September) fix it for you?
Thanks for your series patches.
I have had some problems of receiving post mail from Linux-Renesas
Mailing List recently.
Could you please forward these series patches to me?
Thank you!.
Jinso/Linux-Team
Hiep.
