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

["karim.allah.ahmed@xxxxxxxxx" <karim.allah.ahmed@xxxxxxxxx>]

On Sun, Jan 5, 2014 at 7:28 PM, Stefano Stabellini
<stefano.stabellini@xxxxxxxxxxxxx> wrote:
> Could you use plain text for emails, please?
Sorry about that :)

>
> 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 @@
>>       >  static unsigned int __initdata opt_dom0_max_vcpus;
>>       >  integer_param("dom0_max_vcpus", opt_dom0_max_vcpus);
>>       >
>>       > -static int dom0_11_mapping = 1;
>>       > +static int dom0_11_mapping = 0;
>>       >
>>       >  #define DOM0_MEM_DEFAULT 0x8000000 /* 128 MiB */
>>       >  static 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?

For network "sun4i-emac", and currently I'm mounting my rootfs through
nfs, so no disk/sdcard




-- 
Karim Allah Ahmed.
LinkedIn

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