VPE loader support on 34K

VPE loader support on 34K

[Alan Wu]

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 ?)
2. Is there any sample "Hello World" application for this ? 
3. Any specific tool chain needed ?

Thanks.

VPE loader support on 34K

[Alan Wu]

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 ?)
2. Is there any sample "Hello World" application for this ? 
3. Any specific tool chain needed ?

Thanks.

Re: VPE loader support on 34K

[Ralf Baechle]

On Wed, Mar 25, 2009 at 10:37:20PM +0800, Alan Wu wrote:

> 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 ?)
> 2. Is there any sample "Hello World" application for this ? 
> 3. Any specific tool chain needed ?

I assume you're a MTI customer?  If so I suggest you talk to customer
support.  There are docs, SDE-based toolchain and example code showing
how to use this.  If you understand the technical details it will not
be too difficult to figure out your own solution using a standard
Linux/MIPS toolchains but of course in that case you can't use any of
the userspace libraries for building an AP/SP program.

  Ralf

Re: VPE loader support on 34K

[Kevin D. Kissell]

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.

Re: VPE loader support on 34K

[tiejun.chen]

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 ?)

Exactly.

> 2. Is there any sample "Hello World" application for this ? 
> 3. Any specific tool chain needed ?

I recommend you refer to the file, MIPS® SDE Programmers' Guide (.pdf).
http://www.mips.com/products/product-materials/processor/software/

It's easy to build the sample with SDE. And ever I program a sample to output
some messages from UART to validate AP/AP. I think even you can implement the
same to display something from the LED.

Best Regards
Tiejun

> 
> Thanks.
> 
> 
> 
> 
> 
>