Re: VPE loader support on 34K

["Kevin D. Kissell" <kevink@paralogos.com>]

Alan Wu wrote:
> Hello,
>
> I'm porting 2.6.26 Linux on the platform of MIPS 34K. Currently, the uni-processor 
> kernel model(1 VPE) and SMP model (2 VPE) are up and work perfectly.
>
> Now, I need to port the AP/SP model on a normal Linux uniprocessor kernel model. 
> I'd like to load an application program (ELF ?) into kernel space where this 
> application will run on a Secondary VPE undisturbed by the Linux kernel.
>
> After I enabled the MIPS_VPE_LOADER [=y] in .config , the kernel is up without
> any error/warning message.
>
> Please help :
>
> 1. How to load the application into VPE1 from VPE0 ? (cat XYZapp >/dev/vpe1 ?)
>   
If I recall correctly, yes that's it.
> 2. Is there any sample "Hello World" application for this ? 
> 3. Any specific tool chain needed ?
>   
There was a sort of tool kit distributed by MIPS that provided examples, 
a minimal C runtime library, and tool settings for AP/SP (aka APRP).  
The binaries are ELF, but they aren't linked the way you'd link a 
userland program (they either need to be relocatable, or be linked to 
load at an appropriately high kernel segment address) and of course they 
can't use standard C libraries that do system calls, though there is the 
provision for open/close/read/write of files and devices via a Linux 
kernel server. I'm no longer working for MIPS, so I don't have my copy 
anymore, but I'd like to think that you could find a pointer to the tool 
kit and documentation somewhere on MIPS's web site.  And, as Ralf 
suggested (after I'd started typing this message, but before I got to 
the point of sending it) if you are a MIPS customer, or are a 
subcontractor to one, MIPS customer support should definitely be able to 
get you the necessary tool kit.


          Regards,

          Kevin K.