Hi Magnus, Mar[ck], Sergei, Simon,
This patch series enables SMP on R-Car E2 (r8a7794).
- The first patch initializes CNTVOFF for secondary CPU cores, like is
already done for the boot CPU core. Without this, the ARM arch
timer doesn't work on secondary CPU cores.
- The second patch adds the required infrastructure (APMU device node
and corresponding enable-method) to DT.
This must not be applied on a branch that doesn't have the first
patch!
According to the original comments, the CNTVOFF initialization is needed
on Cortex-A7 only, hence affects R-Car E2, which has a dual Cortex-A7
cluster.
Apparently it's not needed on other R-Car Gen2 members that have (only)
Cortex-A15 clusters.
Perhaps it's also needed on R-Car H2, which has a big.LITTLE
quad Cortex-A15 + quad Cortex-A7 configuration, when running Linux on
the Cortex-A7 cores? How can I test that?
Thanks for your comments!
Geert Uytterhoeven (1):
ARM: shmobile: Add CA7 arch_timer initialization for secondary CPUs
Sergei Shtylyov (1):
ARM: dts: r8a7794: Add SMP support
arch/arm/boot/dts/r8a7794.dtsi | 7 +++++++
arch/arm/mach-shmobile/Makefile | 1 +
arch/arm/mach-shmobile/common.h | 1 +
arch/arm/mach-shmobile/headsmp-apmu.S | 38 +++++++++++++++++++++++++++++++++++
arch/arm/mach-shmobile/platsmp-apmu.c | 2 +-
5 files changed, 48 insertions(+), 1 deletion(-)
create mode 100644 arch/arm/mach-shmobile/headsmp-apmu.S
--
2.7.4
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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