Re: [Xen-devel] XEN[ARM] Master not working on Allwinner A20

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

Could you use plain text for emails, please?

On Sun, 5 Jan 2014, karim.allah.ahmed@xxxxxxxxx wrote:
> On Sun, Jan 5, 2014 at 5:39 PM, Stefano Stabellini 
> <stefano.stabellini@xxxxxxxxxxxxx> wrote:
>       On Sun, 5 Jan 2014, karim.allah.ahmed@xxxxxxxxx wrote:
>       > Hi Peter,
>       >
>       > If you still can't boot with any memory bigger than 128M, as a fast 
> workaround you can apply this patch.
>       >
>       > diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
>       > index faff88e..849df3f 100644
>       > --- a/xen/arch/arm/domain_build.c
>       > +++ b/xen/arch/arm/domain_build.c
>       > @@ -22,7 +22,7 @@
>       > Âstatic unsigned int __initdata opt_dom0_max_vcpus;
>       > Âinteger_param("dom0_max_vcpus", opt_dom0_max_vcpus);
>       > Â
>       > -static int dom0_11_mapping = 1;
>       > +static int dom0_11_mapping = 0;
>       > Â
>       > Â#define DOM0_MEM_DEFAULT 0x8000000 /* 128 MiB */
>       > Âstatic u64 __initdata dom0_mem = DOM0_MEM_DEFAULT;
>       >
>       >
>       > It's failing because none of the zones has a contiguous memory block 
> with an order bigger than 15 ( 128M ). I think
>       this is due
>       > to the alignment of the phys_start with buddy system in cubieboard, 
> I'll look further and let you know if there's a
>       cleaner
>       > approach to fix that.
>       >
>       > It used to work before because the 11_mapping wasn't forced to "true" 
> for all platforms and there was a quirk
>       exposed by the
>       > platform that used to express that. I think Julien removed that quirk 
> and defaulted to 11_mapping in commit
>       > "71952bfcbe9187765cf4010b1479af86def4fb1f"
> 
> Unfortunately dom0_11_mapping is needed if at least one device driver
> for the Allwinner uses DMA.
> For example, if you disable dom0_11_mapping, can you still access the
> network? On the other hand if all device drivers do not use DMA we can
> set dom0_11_mapping to false for this platform.
> 
> 
> I'm not quite sure about all devices in cubieboard, but at least for the 
> network case I think it'll still work ( well, it's
> working for me ) . Besides, Cubieboard didn't have this quirk to begin with 
> before defaulting to the 11_mapping

What is the linux device driver that you are using for the network? And
the one for the disk/sdcard?

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