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