Re: [microblaze-uclinux] FSL

["Stephane Rousseau" <stephaner@xxxxxxxxx>]

Hello Raul,


First thing I will do will be to make sure the component linked to the
FSL is outputing data. You have at least two options:

1- If you have a debug pin or a led available connect it to a
FSL_M_Data signal in your VHDL.
2- Create a vhdl Testbench to make sure your component is working
according to the FSL spec.

Regards,

Stéphane Rousseau


On 10/31/07, Raul Camaras <raul.camaras@xxxxxxxxxxxxxxxxxxx> wrote:
> Hello Stephane,
>
> I have put some printk's in the fsl driver.
> The read call executes the function read_tasklet_func repeatedly in an
> infinite loop.
> Function fsl_nget returns no data(does not block), and at the end
> wake_up(&fsl_read_queue) is executed, so the function read_tasklet_func
> is executed again and again.
> Some idea why this could happen?
> Thanks a lot.
>
> Best regards,
> Raul Camaras
>
> -----Ursprüngliche Nachricht-----
> Von: owner-microblaze-uclinux@xxxxxxxxxxxxxx
> [mailto:owner-microblaze-uclinux@xxxxxxxxxxxxxx] Im Auftrag von Stephane
> Rousseau
> Gesendet: Dienstag, 30. Oktober 2007 18:44
> An: microblaze-uclinux@xxxxxxxxxxxxxx
> Betreff: Re: [microblaze-uclinux] FSL
>
> Hello Raul,
>
> Your read call shouldn't block at least you should receive an error.
> The driver use non blocking nget assembler function to read. Try to
> investigate a litte more.
>
> Using the driver, you should not use the assembly instructions to
> access the FSL link into a userland application, allways use the read
> and write. Assembly instructions are into the low level implementation
> for use exclusivly. This protect userland process to access the
> hardware directly.
>
> Best regards,
>
> Stephane Rousseau
>
>
>
>
>
> On 10/30/07, Raul Camaras <raul.camaras@xxxxxxxxxxxxxxxxxxx> wrote:
> > Hello,
> > Thank you for your answer Stephane.
> > Next problem:
> > An application in Microblaze writing and reading from the FSL works.
> > It uses:
> >
> > asm volatile ("nput %0, rfsl" "0" :: "d" (data_to_local_link[k]));
> >
> > to write, and
> >
> > asm volatile ("nget %0, rfsl" "1" : "=d" (data_back_local_link[r]));
> >
> > to read.
> >
> > Under uClinux I try to use your example code, but the read call blocks
> > any time!
> > Did I forget some call to ioctl??
> > What can be the reason?
> > Thanks a lot.
> > Regards,
> > Raul Camaras
> >
> > -----Ursprüngliche Nachricht-----
> > Von: owner-microblaze-uclinux@xxxxxxxxxxxxxx
> > [mailto:owner-microblaze-uclinux@xxxxxxxxxxxxxx] Im Auftrag von
> Stephane
> > Rousseau
> > Gesendet: Dienstag, 30. Oktober 2007 04:09
> > An: microblaze-uclinux@xxxxxxxxxxxxxx
> > Betreff: Re: [microblaze-uclinux] FSL
> >
> > Hi Raul,
> >
> > If you are on version 2.4, you can use the driver FSLFIFO made by Mr.
> > Williams. FSL driver are not yet available on version 2.6.
> >
> > Here is an exemple assuming a request/response component on the FSL
> link
> > 1 :
> >
> > {
> > filerw = open("/dev/fslfifo1", O_RDWR);
> >
> > res = write(filerw, &dataout[], dimout);
> >
> > res = read(filerw, &datain[], dimin);
> > close(fichier);
> > }
> >
> >
> > Regards,
> >
> > Stephane Rousseau
> >
> > On 10/29/07, Raul Camaras <raul.camaras@xxxxxxxxxxxxxxxxxxx> wrote:
> > > Hello,
> > >
> > > does anybody have an example of using a FSL under uClinux?
> > > Thanks a lot.
> > > Regards,
> > >
> > > Raul Camaras
> > >
> > >
> > >
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