Hi Vineet,
On Tue, 2019-04-02 at 12:18 -0700, Vineet Gupta wrote:
> 1. Bump top level address-cells/size-cells nodes to 2 (to ensure all
> down stream addresses are 64-bits, unless explicitly specified
> otherwise (in "soc" bus with all peripherals)
>
> 2. "memory" also specified with address/size 2
>
> 3. Add a commented reference for PAE40 region beyond 4GB physical
> address space
[see below]
>
> Signed-off-by: Vineet Gupta <vgupta@xxxxxxxxxxxx>
> ---
> arch/arc/boot/dts/hsdk.dts | 13 +++++++------
> 1 file changed, 7 insertions(+), 6 deletions(-)
>
> diff --git a/arch/arc/boot/dts/hsdk.dts b/arch/arc/boot/dts/hsdk.dts
> index 69bc1c9e8e50..7425bb0f2d1b 100644
> --- a/arch/arc/boot/dts/hsdk.dts
> +++ b/arch/arc/boot/dts/hsdk.dts
> @@ -18,8 +18,8 @@
> model = "snps,hsdk";
> compatible = "snps,hsdk";
>
> - #address-cells = <1>;
> - #size-cells = <1>;
> + #address-cells = <2>;
> + #size-cells = <2>;
>
> chosen {
> bootargs = "earlycon=uart8250,mmio32,0xf0005000,115200n8 console=ttyS0,115200n8 debug print-fatal-signals=1";
> @@ -105,7 +105,7 @@
> #size-cells = <1>;
> interrupt-parent = <&idu_intc>;
>
> - ranges = <0x00000000 0xf0000000 0x10000000>;
> + ranges = <0x00000000 0x0 0xf0000000 0x10000000>;
>
> cgu_rst: reset-controller@8a0 {
> compatible = "snps,hsdk-reset";
> @@ -269,9 +269,10 @@
> };
>
> memory@80000000 {
> - #address-cells = <1>;
> - #size-cells = <1>;
> + #address-cells = <2>;
> + #size-cells = <2>;
> device_type = "memory";
> - reg = <0x80000000 0x40000000>; /* 1 GiB */
> + reg = <0x0 0x80000000 0x0 0x40000000>; /* 1 GB lowmem */
> + /* 0x1 0x00000000 0x0 0x40000000>; 1 GB highmem */
Could you please get rid of comment with reference for PAE40/HIGHMEM region in this patch?
It gives wrong expectations that if we uncomment it and enable PAE40 in config we'll get working system.
But it isn't true - we also need to remap AXI apertures appropriately.
Otherwise kernel will crush somewhere. Moreover kernel will crush for different reasons in case of launch
via U-boot and via MDB (because we remap AXI apertures in U-boot for internal purposes).
If you really want to keep this - I can send you patch with AXI apertures remapping we need to apply firstly.
Thanks.
> };
> };
--
Eugeniy Paltsev
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