[ECOS] ZLIB functions

[ECOS] ZLIB functions

[Chris Garry]

Hi,

I have added a function to Redboot to program an FPGA with an
FPGA image stored in FLASH.  This has all been working fine.

Now I am trying to add support for compressed FPGA images
in FLASH.  As part of this I have added the zlib package
to Redboot and tried to write a routine to decompress the
image - but I am seeing some strange things.

When I call the decompress_image function below:


int decompress_image(cyg_uint8 *start_addr, cyg_uint8 *dest_addr)
{
    _pipe_t* p;
    int err;

    diag_printf("Start add: 0x%x\n", start_addr);
    diag_printf("Dest add: 0x%x\n", dest_addr);

    diag_printf("\nInitial values:\n");
    diag_printf("in_buf: 0x%x\n", p->in_buf);
    diag_printf("in_avail: 0x%x\n", p->in_avail);
    diag_printf("out_buf: 0x%x\n", p->out_buf);
    diag_printf("out_size: 0x%x\n", p->out_size);
    diag_printf("out_max: 0x%x\n", p->out_max);

    // Initialise pipe values
    p->in_buf = start_addr;
    p->in_avail = 0x00;
    p->out_buf = dest_addr;
    p->out_size = 0x00;
    p->out_max = 0x100;

    diag_printf("\nBefore _dc_int() is called:\n");
    diag_printf("in_buf: 0x%x\n", p->in_buf);
    diag_printf("in_avail: 0x%x\n", p->in_avail);
    diag_printf("out_buf: 0x%x\n", p->out_buf);
    diag_printf("out_size: 0x%x\n", p->out_size);
    diag_printf("out_max: 0x%x\n", p->out_max);

    // Call the decompress initialise function
    err = (*_dc_init)(p);
    diag_printf("Err: 0x%x\n", err);

    diag_printf("\nAfter _dc_int() has been called:\n");
    diag_printf("in_buf: 0x%x\n", p->in_buf);
    diag_printf("in_avail: 0x%x\n", p->in_avail);
    diag_printf("out_buf: 0x%x\n", p->out_buf);
    diag_printf("out_size: 0x%x\n", p->out_size);
    diag_printf("out_max: 0x%x\n", p->out_max);

    return 1;
}


I get the following output:

-- Output start
Start add: 0x1840000
Dest add: 0x10000

Initial values:
in_buf: 0xa
in_avail: 0x53324358
out_buf: 0x46203531
out_size: 0x20414750
out_max: 0x65746564

Before _dc_int() is called:
in_buf: 0x1840000
in_avail: 0x0
out_buf: 0x10000
out_size: 0x0
out_max: 0x65746564
Err: 0x0

After _dc_int() has been called:
in_buf: 0xa
in_avail: 0x53324358
out_buf: 0x46203531
out_size: 0x20414750
out_max: 0x65746564
-- Output end

I notice that before the _dc_int() function has been called
p->out_max has failed to take the value 0x100.  After
_dc_int() has been called all the values have reverted to
their uninitialized state.

If I comment out the 'err = (*_dc_init)(p);' line everything
works as expected.  Also adding or removing diag_printf's
change which pipe values get correctly initialized before
the _dc_int() function is called.

Does anybody have any ideas as to what is going wrong?

Thanks,
Chris







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Re: [ECOS] ZLIB functions

[Chris Garry]

Okay, looking at the code fresh I see my basic C coding error.
Whoops.

Chris

----- Original Message ----- 
From: "Chris Garry" <chris_garry@yahoo.co.uk>
To: <ecos-discuss@sources.redhat.com>
Sent: Thursday, November 14, 2002 12:18 PM
Subject: [ECOS] ZLIB functions


> Hi,
> 
> I have added a function to Redboot to program an FPGA with an
> FPGA image stored in FLASH.  This has all been working fine.
> 
> Now I am trying to add support for compressed FPGA images
> in FLASH.  As part of this I have added the zlib package
> to Redboot and tried to write a routine to decompress the
> image - but I am seeing some strange things.
> 
> When I call the decompress_image function below:
> 
> 
> int decompress_image(cyg_uint8 *start_addr, cyg_uint8 *dest_addr)
> {
>     _pipe_t* p;
>     int err;
> 
>     diag_printf("Start add: 0x%x\n", start_addr);
>     diag_printf("Dest add: 0x%x\n", dest_addr);
> 
>     diag_printf("\nInitial values:\n");
>     diag_printf("in_buf: 0x%x\n", p->in_buf);
>     diag_printf("in_avail: 0x%x\n", p->in_avail);
>     diag_printf("out_buf: 0x%x\n", p->out_buf);
>     diag_printf("out_size: 0x%x\n", p->out_size);
>     diag_printf("out_max: 0x%x\n", p->out_max);
> 
>     // Initialise pipe values
>     p->in_buf = start_addr;
>     p->in_avail = 0x00;
>     p->out_buf = dest_addr;
>     p->out_size = 0x00;
>     p->out_max = 0x100;
> 
>     diag_printf("\nBefore _dc_int() is called:\n");
>     diag_printf("in_buf: 0x%x\n", p->in_buf);
>     diag_printf("in_avail: 0x%x\n", p->in_avail);
>     diag_printf("out_buf: 0x%x\n", p->out_buf);
>     diag_printf("out_size: 0x%x\n", p->out_size);
>     diag_printf("out_max: 0x%x\n", p->out_max);
> 
>     // Call the decompress initialise function
>     err = (*_dc_init)(p);
>     diag_printf("Err: 0x%x\n", err);
> 
>     diag_printf("\nAfter _dc_int() has been called:\n");
>     diag_printf("in_buf: 0x%x\n", p->in_buf);
>     diag_printf("in_avail: 0x%x\n", p->in_avail);
>     diag_printf("out_buf: 0x%x\n", p->out_buf);
>     diag_printf("out_size: 0x%x\n", p->out_size);
>     diag_printf("out_max: 0x%x\n", p->out_max);
> 
>     return 1;
> }
> 
> 
> I get the following output:
> 
> -- Output start
> Start add: 0x1840000
> Dest add: 0x10000
> 
> Initial values:
> in_buf: 0xa
> in_avail: 0x53324358
> out_buf: 0x46203531
> out_size: 0x20414750
> out_max: 0x65746564
> 
> Before _dc_int() is called:
> in_buf: 0x1840000
> in_avail: 0x0
> out_buf: 0x10000
> out_size: 0x0
> out_max: 0x65746564
> Err: 0x0
> 
> After _dc_int() has been called:
> in_buf: 0xa
> in_avail: 0x53324358
> out_buf: 0x46203531
> out_size: 0x20414750
> out_max: 0x65746564
> -- Output end
> 
> I notice that before the _dc_int() function has been called
> p->out_max has failed to take the value 0x100.  After
> _dc_int() has been called all the values have reverted to
> their uninitialized state.
> 
> If I comment out the 'err = (*_dc_init)(p);' line everything
> works as expected.  Also adding or removing diag_printf's
> change which pipe values get correctly initialized before
> the _dc_int() function is called.
> 
> Does anybody have any ideas as to what is going wrong?
> 
> Thanks,
> Chris
> 
> 
> 
> 
> 
> 
> 
> __________________________________________________
> Do you Yahoo!?
> Yahoo! Web Hosting - Let the expert host your site
> http://webhosting.yahoo.com
> 
> -- 
> Before posting, please read the FAQ: http://sources.redhat.com/fom/ecos
> and search the list archive: http://sources.redhat.com/ml/ecos-discuss
> 

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Before posting, please read the FAQ: http://sources.redhat.com/fom/ecos
and search the list archive: http://sources.redhat.com/ml/ecos-discuss