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2008-07-01 Joel Sherrill <joel.sherrill@oarcorp.com>

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* shared/uboot_getenv.c: New file.
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Joel Sherrill
2008-07-01 19:13:22 +00:00
parent 5223d6b543
commit a060e34ff1
2 changed files with 72 additions and 0 deletions
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4
c/src/lib/libbsp/powerpc/ChangeLog
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2008-07-01 Joel Sherrill <joel.sherrill@oarcorp.com>
* shared/uboot_getenv.c: New file.
2008-06-02 Joel Sherrill <joel.sherrill@oarcorp.com>
* shared/startup/panic.c: Convention calls for leading underscore on

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c/src/lib/libbsp/powerpc/shared/uboot_getenv.c Normal file
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/*
* COPYRIGHT (c) 1989-2008.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*
* $Id$
*/
#include <stdint.h>
#include <string.h>
/* Assumed to be provided by BSP */
extern const uint8_t *uboot_environment;
extern const size_t uboot_environment_size;
/*
* The U-Boot source code appears to use the CRC32 code from zlib.
* But I cannot find a way to get the crc32() in zlib code to
* generate the CRC found in the Flash on the Icecube board.
* So for now, always return TRUE.
*/
static int bsp_uboot_environ_check_crc(void)
{
#if 0
unsigned long crc;
unsigned long max;
for (max=0 ; max <= 0x20000 ; max+=4 ) {
crc = crc32( 0, NULL, 0 );
crc = crc32( crc, &uboot_environment[4], max);
printk( "crc=0x%08lx need %0x max=%d\n", crc,
*(int *)uboot_environment, max );
}
#endif
return 1;
}
const char *bsp_uboot_getenv(
const char *name
)
{
char lhs[64];
size_t i, j;
if ( !bsp_uboot_environ_check_crc() )
return NULL;
for ( i=4 ; i<uboot_environment_size ; i++ ) {
memset( lhs, '\0', sizeof(lhs) );
for( j=0 ; uboot_environment[i] != '=' && j<sizeof(lhs) ; i++, j++ ) {
lhs[j] = uboot_environment[i];
}
if ( !strncmp( name, lhs, sizeof(lhs) ) ) {
return (const char *)&uboot_environment[i+1];
}
for ( i++ ; uboot_environment[i] && i<uboot_environment_size ; i++ )
;
if ( !uboot_environment[i+1] )
return NULL;
}
return NULL;
}