upstream u-boot with additional patches for our devices/boards: https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ; Gbit ethernet patch for some LIME2 revisions ; with SPI flash support
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u-boot/include/u-boot/sha256.h

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#ifndef _SHA256_H
#define _SHA256_H
#define SHA256_SUM_LEN 32
#define SHA256_DER_LEN 19
extern const uint8_t sha256_der_prefix[];
/* Reset watchdog each time we process this many bytes */
#define CHUNKSZ_SHA256 (64 * 1024)
typedef struct {
uint32_t total[2];
uint32_t state[8];
uint8_t buffer[64];
} sha256_context;
void sha256_starts(sha256_context * ctx);
void sha256_update(sha256_context *ctx, const uint8_t *input, uint32_t length);
void sha256_finish(sha256_context * ctx, uint8_t digest[SHA256_SUM_LEN]);
void sha256_csum_wd(const unsigned char *input, unsigned int ilen,
unsigned char *output, unsigned int chunk_sz);
#endif /* _SHA256_H */