Re: [ECOS] ZLIB functions

["Chris Garry" <cgarry at sweeneydesign dot co dot uk>]

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
> 
> 
> 
> 
> 
> 
> 
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