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Re: [XenARM] Question about booting parameter of Mini-OS for ARM



On Sun, 24 Mar 2013, Chen Baozi wrote:
> Hi all,
> 
> I'm reading Mini-OS's codes and to estimate the amount of work porting it to
> ARM (Ian's GSoC idea this year).
> 
> While Xen is booting Mini-OS on x86 platform, it passes the start_info_t to
> the guest through ESI register. And Mini-OS would use this structure as the 
> argument of start_kernel. However, I didn't see codes handle the
> start_info_t on ARM side. Instead, I see a more standard protocal when
> booting ARM's dom0, which follows linux kernel bootstrap rules:
> 
>       r0 = 0, r1 = machine nr, r2 = atags or dtb pointer
> 
> Does it mean that Xen for ARM does not use the start_info_t to pass
> information when booting PV guest? 
> Or did I miss something important?

That's right, we don't use start_info_t on ARM, in fact ARM guests are
not exactly like x86 PV guests.
The information present in the start_info page are either available via
device tree or no used on ARM.

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