On Tue, Feb 21, 2017 at 8:29 PM, Andreas Färber [off-list ref] wrote:

Hello,

This series adds initial support for the Marvell IAP140 SoC (aka PXA1908)
and the Andromeda Box Edge development board.

v2 reuses ARCH_MMP.

Both earlycon and serial are working, but an explicit console=ttyS0,115200n8
is needed; with just "earlycon" and stdout-path the earlycon stops early and
switches to a tty0, long before disabling the bootconsole...

All four CPUs come up, and an initrd can be reached.

However, there are errors about CPUs 1-3 having a zero SYS_CNTFRQ_EL0:

[    0.095812] smp: Bringing up secondary CPUs ...
======pxa1908_pmu_core_pwr_on: mpidr = 0x1
======pxa1908_pmu_core_pwr_on: mpidr = 0x2
======pxa1908_pmu_core_pwr_on: mpidr = 0x3
[    0.133419] Detected VIPT I-cache on CPU1
[    0.133430] CPU features: SANITY CHECK: Unexpected variation in SYS_CNTFRQ_EL0. Boot CPU: 0x000000018cba80, CPU1: 0x00000000000000
[    0.133447] Unsupported CPU feature variation.
...
[    0.133748] CPU1: Booted secondary processor [410fd032]
[    0.165465] Detected VIPT I-cache on CPU2
[    0.165474] CPU features: SANITY CHECK: Unexpected variation in SYS_CNTFRQ_EL0. Boot CPU: 0x000000018cba80, CPU2: 0x00000000000000
[    0.165505] CPU2: Booted secondary processor [410fd032]
[    0.197539] Detected VIPT I-cache on CPU3
[    0.197546] CPU features: SANITY CHECK: Unexpected variation in SYS_CNTFRQ_EL0. Boot CPU: 0x000000018cba80, CPU3: 0x00000000000000
[    0.197573] CPU3: Booted secondary processor [410fd032]
[    0.197625] smp: Brought up 1 node, 4 CPUs
[    0.522514] SMP: Total of 4 processors activated.
[    0.527212] CPU features: detected feature: 32-bit EL0 Support
[    0.533105] CPU: All CPU(s) started at EL2

KVM appears to initialize okay, but was not yet tested with guests.

[    0.865255] kvm [1]: 8-bit VMID
[    0.868401] kvm [1]: IDMAP page: d23000
[    0.872233] kvm [1]: HYP VA range: 800000000000:ffffffffffff
[    0.878262] kvm [1]: Hyp mode initialized successfully
[    0.883429] kvm [1]: vgic-v2@d1dfc000
[    0.887179] kvm [1]: vgic interrupt IRQ1
[    0.891120] kvm [1]: virtual timer IRQ4

One limitation is currently the lack of an IAP140 clk driver. Patch 4/4 works
around that for UART0 with a fixed-clock.

The PXA1928 clock driver should be close to what you need. They are
supposed to be very similar.

A 3.14 based tree is available on GitHub acorn-marvell/brillo_pxa_kernel.

Booting required changes to the vendor U-Boot,
cf. https://en.opensuse.org/HCL:AndromedaBoxEdge

https://github.com/afaerber/linux/commits/edge-next

Have a lot of fun!

Cheers,
Andreas

v1 -> v2:
* Add non-DT documentation
* Use ARCH_MMP instead of ARCH_PXA
* Split off Kconfig cleanups per subsystem
* Drop "mrvl,pxa-uart" and instead implement mmp earlycon
* Add some more DT nodes

Cc: Thomas Petazzoni <thomas.petazzoni-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
Cc: Gregory Clement <gregory.clement-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
Cc: info-PWLG29+z7hGxBmiGZ5/UTQ@public.gmane.org
Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org

Andreas Färber (8):
  Documentation: arm: Marvell: Document IAP140
  tty: serial: Suppress deprecated SERIAL_PXA on arm64
  tty: serial: 8250_pxa: Implement mmp earlycon

You should not use the pxa serial driver. AFAICT, it was separate to
add DMA support, but now the base 8250 driver supports DMA. The base
8250 driver works with the PXA1928 and should also work with the
PXA1908.

  sound: soc: pxa: Suppress SND_MMP_SOC for arm64
  ARM64: Prepare Marvell IAP140 aka PXA1908
  Documentation: devicetree: arm: marvell: Document IAP140
  ARM64: dts: marvell: Add IAP140 and Andromeda Box Edge
  ARM64: dts: marvell: iap140-andromeda-box-edge: Add uart0 clock
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