> -----Original Message-----
> From: Li Yang-Leo-R58472
> Sent: Tuesday, September 22, 2015 10:53 PM
> To: Hou Zhiqiang-B48286; Mark Rutland; marc.zyngier@xxxxxxx
> Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; Catalin Marinas; Will Deacon;
> linux-i2c@xxxxxxxxxxxxxxx; linux-watchdog@xxxxxxxxxxxxxxx; linux-
> doc@xxxxxxxxxxxxxxx; linux-clk@xxxxxxxxxxxxxxx; Xie Shaohui-B21989;
> corbet@xxxxxxx; Sharma Bhupesh-B45370; mturquette@xxxxxxxxxxxx; wsa@the-
> dreams.de; sboyd@xxxxxxxxxxxxxx; wim@xxxxxxxxx; Song Wenbin-B53747; Wood
> Scott-B07421; Hu Mingkai-B21284
> Subject: RE: [PATCH 4/6] arm64/ls1043a: add DTS for Freescale LS1043A SoC
>
> > >
> > > Hi,
> > >
> > > > +/memreserve/ 0x80000000 0x00010000;
> > >
> > > Why is this necessary?
> >
> > This memory region is pre-reserved for the spin-table/psci, although
> > didn't add Enable method of secondary cores.
>
> Can this be reserved by bootloader?
No need to reserve this for PSCI based secondary bootup.
> >
> > > If this is necessary, please add a comment stating what this is for.
> > >
> > > > + cpu@3 {
> > > > + device_type = "cpu";
> > > > + compatible = "arm,cortex-a53";
> > > > + reg = <0x0 0x3>;
> > > > + clocks = <&clockgen 1 0>;
> > > > + };
> > >
> > > Missing enable-method properties on all the secondary CPUs.
> > >
> >
> > There are two methods (spin-table and psci) to bring up secondary
> > cores, which one do you think is better?
>
> Do we have the PSCI support ready in both UEFI and u-boot? If not, we
> should use spin-table for now.
UEFI has been using PSCI with Arm Trusted Firmware (ATF) since some time. U-boot can also work with ATF seamlessly.
Spin-table method is deprecated and newer patches should support PSCI. If not, all intelligence should be left to the
Bootloader and the Linux DTS should not mention the 'enable-method' and the 'memreserve' regions.
For details please see the LS2085A Freescale DTS already present in mainline kernel.
Regards,
Bhupesh
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