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Verify data after writing

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This commit is contained in:
Michael Brown 2006-12-06 18:51:31 +00:00
parent 5edb85c8b4
commit ac401f481d
1 changed files with 35 additions and 1 deletions
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36
src/drivers/nvs/nvs.c
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@ -17,6 +17,8 @@
*/
#include <stdint.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#include <gpxe/nvs.h>
@ -69,6 +71,34 @@ int nvs_read ( struct nvs_device *nvs, unsigned int address,
return 0;
}
/**
* Verify content of non-volatile storage device
*
* @v nvs NVS device
* @v address Address from which to read
* @v data Data to compare against
* @v len Length of data buffer
* @ret rc Return status code
*/
static int nvs_verify ( struct nvs_device *nvs, unsigned int address,
const void *data, size_t len ) {
uint8_t read_data[len];
int rc;
/* Read data into temporary buffer */
if ( ( rc = nvs_read ( nvs, address, read_data, len ) ) != 0 )
return rc;
/* Compare data */
if ( memcmp ( data, read_data, len ) != 0 ) {
DBG ( "NVS %p verification failed at %#04x+%d\n",
nvs, address, len );
return -EINVAL;
}
return 0;
}
/**
* Write to non-volatile storage device
*
@ -99,10 +129,14 @@ int nvs_write ( struct nvs_device *nvs, unsigned int address,
if ( frag_len > len )
frag_len = len;
/* Read this portion of the buffer from the device */
/* Write this portion of the buffer to the device */
if ( ( rc = nvs->write ( nvs, address, data, frag_len ) ) != 0)
return rc;
/* Read back and verify data */
if ( ( rc = nvs_verify ( nvs, address, data, frag_len ) ) != 0)
return rc;
/* Update parameters */
data += frag_len;
address += ( frag_len >> nvs->word_len_log2 );