Re: [Xen-devel] Question about running Xen 4.4 on Arndale board

[Suriyan Ramasami <suriyan.r@xxxxxxxxx>]

On Mon, Apr 14, 2014 at 10:37 AM, Julien Grall <julien.grall@xxxxxxxxxx> wrote:
> On 04/14/2014 06:07 PM, Suriyan Ramasami wrote:
>
>> Also, please note the typo for EARLY_PRINTK_BAUD. I guess Julien
>> missed a 0 at the end.
>
> Hrmmm, right. I didn't check my patch.
>
>>
>> For the exynos5410, this is what I did with some expert guidance from
>> Julien and Ian Campbell. I shall document it here, as it might help
>> you too.
>>
>> Changes in XEN (xen 4.4 stable) (first lets get XEN to boot and show
>> some output)
>> 1. change: xen/arch/arm/platforms/exynos5.c structure:
>> exynos5_dt_compat[], and add âsamsung,exynos5410â in that list
>>    For you it might be "samsung,exynos5420" -> check your dtsi file.
>
> Do you plan to send a patch for adding odroid Xu support in Xen?
>
That is my intent. I have yet to find time to resolve the other issues
when enabling multiple CPUs.
>
>> 2. Linux kernel exynos5410.dtsi (for you possibly exynos5420.dtsi)to
>> have the ARCH generic timer information. You might already have it.
>
> Do you plan to send this patch on Linux upstream?
>
I guess I will take this one up as well.

>> timer {
>>  compatible = "arm,cortexÂa15Âtimer","arm,armv7Âtimer";
>
> I guess you meant arm,armv7-timer?
That is correct, somehow the "-" characters got eaten in the email. It
should be:
"arm,cortex-a15-timer", "arm,armv7-timer"

>
>>  interrupts = <1 13 0xf08>,
>>           <1 14 0xf08>,
>>           <1 11 0xf08>,
>>           <1 10 0xf08>;
>>           clockÂfrequency = <24000000>;
>> };
>> Above works for 5250 and 5410.
>> 3. Comment out all CPUs but the first cpu to start with (done in your
>> exynos5420.dtsi file)
>> 4. As Tod mentioned, you are missing the dtb file that you need to
>> pass as 3rd parameter to the bootm command. -> bootm $kernel_addr_t -
>> $dtb_addr_t
>> 5. The bootargs that you have set for xen, need to have the
>> console=dtuart dtuart=/serial@12C20000.
>>    For you as Julien pointed out it might be @12C30000
>> I am not sure if just settign bootargs will help. I wonder if it has
>> to be fdt set to /chosen etc. I have pasted a working env file which
>> you can modify and convert to scr to run it if need be.
>
> We should see some messages
>
>> For building XEN (make dist-xen), I am not sure if you have to add
>> debug=y as well for the CONFIG_EARLY_PRINTK=exynos5420 to be pulled in
>> - but, please do check on that.
>
> Aargh, I though Ian's patch to print an error when CONFIG_EARLY_PRINTK
> is used without debug=y was in Xen 4.4.
>
> From HyonYoung's previous mail, debug=y was not set.
>
> Regards,
>
> --
> Julien Grall

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