diff --git a/drivers/net/sfc/base/ef10_image.c b/drivers/net/sfc/base/ef10_image.c
index e076f40..6fb7e47 100644
--- a/drivers/net/sfc/base/ef10_image.c
+++ b/drivers/net/sfc/base/ef10_image.c
@@ -11,7 +11,872 @@
 
 #if EFSYS_OPT_IMAGE_LAYOUT
 
-#include "ef10_signed_image_layout.h"
+/*
+ * Utility routines to support limited parsing of ASN.1 tags. This is not a
+ * general purpose ASN.1 parser, but is sufficient to locate the required
+ * objects in a signed image with CMS headers.
+ */
+
+/* DER encodings for ASN.1 tags (see ITU-T X.690) */
+#define	ASN1_TAG_INTEGER	    (0x02)
+#define	ASN1_TAG_OCTET_STRING	    (0x04)
+#define	ASN1_TAG_OBJ_ID		    (0x06)
+#define	ASN1_TAG_SEQUENCE	    (0x30)
+#define	ASN1_TAG_SET		    (0x31)
+
+#define	ASN1_TAG_IS_PRIM(tag)	    ((tag & 0x20) == 0)
+
+#define	ASN1_TAG_PRIM_CONTEXT(n)    (0x80 + (n))
+#define	ASN1_TAG_CONS_CONTEXT(n)    (0xA0 + (n))
+
+typedef struct efx_asn1_cursor_s {
+	uint8_t		*buffer;
+	uint32_t	length;
+
+	uint8_t		tag;
+	uint32_t	hdr_size;
+	uint32_t	val_size;
+} efx_asn1_cursor_t;
+
+
+/* Parse header of DER encoded ASN.1 TLV and match tag */
+static	__checkReturn	efx_rc_t
+efx_asn1_parse_header_match_tag(
+	__inout		efx_asn1_cursor_t	*cursor,
+	__in		uint8_t			tag)
+{
+	efx_rc_t rc;
+
+	if (cursor == NULL || cursor->buffer == NULL || cursor->length < 2) {
+		rc = EINVAL;
+		goto fail1;
+	}
+
+	cursor->tag = cursor->buffer[0];
+	if (cursor->tag != tag) {
+		/* Tag not matched */
+		rc = ENOENT;
+		goto fail2;
+	}
+
+	if ((cursor->tag & 0x1F) == 0x1F) {
+		/* Long tag format not used in CMS syntax */
+		rc = EINVAL;
+		goto fail3;
+	}
+
+	if ((cursor->buffer[1] & 0x80) == 0) {
+		/* Short form: length is 0..127 */
+		cursor->hdr_size = 2;
+		cursor->val_size = cursor->buffer[1];
+	} else {
+		/* Long form: length encoded as [0x80+nbytes][length bytes] */
+		uint32_t nbytes = cursor->buffer[1] & 0x7F;
+		uint32_t offset;
+
+		if (nbytes == 0) {
+			/* Indefinite length not allowed in DER encoding */
+			rc = EINVAL;
+			goto fail4;
+		}
+		if (2 + nbytes > cursor->length) {
+			/* Header length overflows image buffer */
+			rc = EINVAL;
+			goto fail6;
+		}
+		if (nbytes > sizeof (uint32_t)) {
+			/* Length encoding too big */
+			rc = E2BIG;
+			goto fail5;
+		}
+		cursor->hdr_size = 2 + nbytes;
+		cursor->val_size = 0;
+		for (offset = 2; offset < cursor->hdr_size; offset++) {
+			cursor->val_size =
+			    (cursor->val_size << 8) | cursor->buffer[offset];
+		}
+	}
+
+	if ((cursor->hdr_size + cursor->val_size) > cursor->length) {
+		/* Length overflows image buffer */
+		rc = E2BIG;
+		goto fail7;
+	}
+
+	return (0);
+
+fail7:
+	EFSYS_PROBE(fail7);
+fail6:
+	EFSYS_PROBE(fail6);
+fail5:
+	EFSYS_PROBE(fail5);
+fail4:
+	EFSYS_PROBE(fail4);
+fail3:
+	EFSYS_PROBE(fail3);
+fail2:
+	EFSYS_PROBE(fail2);
+fail1:
+	EFSYS_PROBE1(fail1, efx_rc_t, rc);
+
+	return (rc);
+}
+
+/* Enter nested ASN.1 TLV (contained in value of current TLV) */
+static	__checkReturn	efx_rc_t
+efx_asn1_enter_tag(
+	__inout		efx_asn1_cursor_t	*cursor,
+	__in		uint8_t			tag)
+{
+	efx_rc_t rc;
+
+	if (cursor == NULL) {
+		rc = EINVAL;
+		goto fail1;
+	}
+
+	if (ASN1_TAG_IS_PRIM(tag)) {
+		/* Cannot enter a primitive tag */
+		rc = ENOTSUP;
+		goto fail2;
+	}
+	rc = efx_asn1_parse_header_match_tag(cursor, tag);
+	if (rc != 0) {
+		/* Invalid TLV or wrong tag */
+		goto fail3;
+	}
+
+	/* Limit cursor range to nested TLV */
+	cursor->buffer += cursor->hdr_size;
+	cursor->length = cursor->val_size;
+
+	return (0);
+
+fail3:
+	EFSYS_PROBE(fail3);
+fail2:
+	EFSYS_PROBE(fail2);
+fail1:
+	EFSYS_PROBE1(fail1, efx_rc_t, rc);
+
+	return (rc);
+}
+
+/*
+ * Check that the current ASN.1 TLV matches the given tag and value.
+ * Advance cursor to next TLV on a successful match.
+ */
+static	__checkReturn	efx_rc_t
+efx_asn1_match_tag_value(
+	__inout		efx_asn1_cursor_t	*cursor,
+	__in		uint8_t			tag,
+	__in		const void		*valp,
+	__in		uint32_t		val_size)
+{
+	efx_rc_t rc;
+
+	if (cursor == NULL) {
+		rc = EINVAL;
+		goto fail1;
+	}
+	rc = efx_asn1_parse_header_match_tag(cursor, tag);
+	if (rc != 0) {
+		/* Invalid TLV or wrong tag */
+		goto fail2;
+	}
+	if (cursor->val_size != val_size) {
+		/* Value size is different */
+		rc = EINVAL;
+		goto fail3;
+	}
+	if (memcmp(cursor->buffer + cursor->hdr_size, valp, val_size) != 0) {
+		/* Value content is different */
+		rc = EINVAL;
+		goto fail4;
+	}
+	cursor->buffer += cursor->hdr_size + cursor->val_size;
+	cursor->length -= cursor->hdr_size + cursor->val_size;
+
+	return (0);
+
+fail4:
+	EFSYS_PROBE(fail4);
+fail3:
+	EFSYS_PROBE(fail3);
+fail2:
+	EFSYS_PROBE(fail2);
+fail1:
+	EFSYS_PROBE1(fail1, efx_rc_t, rc);
+
+	return (rc);
+}
+
+/* Advance cursor to next TLV */
+static	__checkReturn	efx_rc_t
+efx_asn1_skip_tag(
+	__inout		efx_asn1_cursor_t	*cursor,
+	__in		uint8_t			tag)
+{
+	efx_rc_t rc;
+
+	if (cursor == NULL) {
+		rc = EINVAL;
+		goto fail1;
+	}
+
+	rc = efx_asn1_parse_header_match_tag(cursor, tag);
+	if (rc != 0) {
+		/* Invalid TLV or wrong tag */
+		goto fail2;
+	}
+	cursor->buffer += cursor->hdr_size + cursor->val_size;
+	cursor->length -= cursor->hdr_size + cursor->val_size;
+
+	return (0);
+
+fail2:
+	EFSYS_PROBE(fail2);
+fail1:
+	EFSYS_PROBE1(fail1, efx_rc_t, rc);
+
+	return (rc);
+}
+
+/* Return pointer to value octets and value size from current TLV */
+static	__checkReturn	efx_rc_t
+efx_asn1_get_tag_value(
+	__inout		efx_asn1_cursor_t	*cursor,
+	__in		uint8_t			tag,
+	__out		uint8_t			**valp,
+	__out		uint32_t		*val_sizep)
+{
+	efx_rc_t rc;
+
+	if (cursor == NULL || valp == NULL || val_sizep == NULL) {
+		rc = EINVAL;
+		goto fail1;
+	}
+
+	rc = efx_asn1_parse_header_match_tag(cursor, tag);
+	if (rc != 0) {
+		/* Invalid TLV or wrong tag */
+		goto fail2;
+	}
+	*valp = cursor->buffer + cursor->hdr_size;
+	*val_sizep = cursor->val_size;
+
+	return (0);
+
+fail2:
+	EFSYS_PROBE(fail2);
+fail1:
+	EFSYS_PROBE1(fail1, efx_rc_t, rc);
+
+	return (rc);
+}
+
+
+/*
+ * Utility routines for parsing CMS headers (see RFC2315, PKCS#7)
+ */
+
+/* OID 1.2.840.113549.1.7.2 */
+static const uint8_t PKCS7_SignedData[] =
+{ 0x2A, 0x86, 0x48, 0x86, 0xF7, 0x0D, 0x01, 0x07, 0x02 };
+
+/* OID 1.2.840.113549.1.7.1 */
+static const uint8_t PKCS7_Data[] =
+{ 0x2A, 0x86, 0x48, 0x86, 0xF7, 0x0D, 0x01, 0x07, 0x01 };
+
+/* SignedData structure version */
+static const uint8_t SignedData_Version[] =
+{ 0x03 };
+
+/*
+ * Check for a valid image in signed image format. This uses CMS syntax
+ * (see RFC2315, PKCS#7) to provide signatures, and certificates required
+ * to validate the signatures. The encapsulated content is in unsigned image
+ * format (reflash header, image code, trailer checksum).
+ */
+static	__checkReturn	efx_rc_t
+efx_check_signed_image_header(
+	__in		void		*bufferp,
+	__in		uint32_t	buffer_size,
+	__out		uint32_t	*content_offsetp,
+	__out		uint32_t	*content_lengthp)
+{
+	efx_asn1_cursor_t cursor;
+	uint8_t *valp;
+	uint32_t val_size;
+	efx_rc_t rc;
+
+	if (content_offsetp == NULL || content_lengthp == NULL) {
+		rc = EINVAL;
+		goto fail1;
+	}
+	cursor.buffer = (uint8_t *)bufferp;
+	cursor.length = buffer_size;
+
+	/* ContextInfo */
+	rc = efx_asn1_enter_tag(&cursor, ASN1_TAG_SEQUENCE);
+	if (rc != 0)
+		goto fail2;
+
+	/* ContextInfo.contentType */
+	rc = efx_asn1_match_tag_value(&cursor, ASN1_TAG_OBJ_ID,
+	    PKCS7_SignedData, sizeof (PKCS7_SignedData));
+	if (rc != 0)
+		goto fail3;
+
+	/* ContextInfo.content */
+	rc = efx_asn1_enter_tag(&cursor, ASN1_TAG_CONS_CONTEXT(0));
+	if (rc != 0)
+		goto fail4;
+
+	/* SignedData */
+	rc = efx_asn1_enter_tag(&cursor, ASN1_TAG_SEQUENCE);
+	if (rc != 0)
+		goto fail5;
+
+	/* SignedData.version */
+	rc = efx_asn1_match_tag_value(&cursor, ASN1_TAG_INTEGER,
+	    SignedData_Version, sizeof (SignedData_Version));
+	if (rc != 0)
+		goto fail6;
+
+	/* SignedData.digestAlgorithms */
+	rc = efx_asn1_skip_tag(&cursor, ASN1_TAG_SET);
+	if (rc != 0)
+		goto fail7;
+
+	/* SignedData.encapContentInfo */
+	rc = efx_asn1_enter_tag(&cursor, ASN1_TAG_SEQUENCE);
+	if (rc != 0)
+		goto fail8;
+
+	/* SignedData.encapContentInfo.econtentType */
+	rc = efx_asn1_match_tag_value(&cursor, ASN1_TAG_OBJ_ID,
+	    PKCS7_Data, sizeof (PKCS7_Data));
+	if (rc != 0)
+		goto fail9;
+
+	/* SignedData.encapContentInfo.econtent */
+	rc = efx_asn1_enter_tag(&cursor, ASN1_TAG_CONS_CONTEXT(0));
+	if (rc != 0)
+		goto fail10;
+
+	/*
+	 * The octet string contains the image header, image code bytes and
+	 * image trailer CRC (same as unsigned image layout).
+	 */
+	valp = NULL;
+	val_size = 0;
+	rc = efx_asn1_get_tag_value(&cursor, ASN1_TAG_OCTET_STRING,
+	    &valp, &val_size);
+	if (rc != 0)
+		goto fail11;
+
+	if ((valp == NULL) || (val_size == 0)) {
+		rc = EINVAL;
+		goto fail12;
+	}
+	if (valp < (uint8_t *)bufferp) {
+		rc = EINVAL;
+		goto fail13;
+	}
+	if ((valp + val_size) > ((uint8_t *)bufferp + buffer_size)) {
+		rc = EINVAL;
+		goto fail14;
+	}
+
+	*content_offsetp = (uint32_t)(valp - (uint8_t *)bufferp);
+	*content_lengthp = val_size;
+
+	return (0);
+
+fail14:
+	EFSYS_PROBE(fail14);
+fail13:
+	EFSYS_PROBE(fail13);
+fail12:
+	EFSYS_PROBE(fail12);
+fail11:
+	EFSYS_PROBE(fail11);
+fail10:
+	EFSYS_PROBE(fail10);
+fail9:
+	EFSYS_PROBE(fail9);
+fail8:
+	EFSYS_PROBE(fail8);
+fail7:
+	EFSYS_PROBE(fail7);
+fail6:
+	EFSYS_PROBE(fail6);
+fail5:
+	EFSYS_PROBE(fail5);
+fail4:
+	EFSYS_PROBE(fail4);
+fail3:
+	EFSYS_PROBE(fail3);
+fail2:
+	EFSYS_PROBE(fail2);
+fail1:
+	EFSYS_PROBE1(fail1, efx_rc_t, rc);
+
+	return (rc);
+}
+
+static	__checkReturn	efx_rc_t
+efx_check_unsigned_image(
+	__in		void		*bufferp,
+	__in		uint32_t	buffer_size)
+{
+	efx_image_header_t *header;
+	efx_image_trailer_t *trailer;
+	uint32_t crc;
+	efx_rc_t rc;
+
+	EFX_STATIC_ASSERT(sizeof (*header) == EFX_IMAGE_HEADER_SIZE);
+	EFX_STATIC_ASSERT(sizeof (*trailer) == EFX_IMAGE_TRAILER_SIZE);
+
+	/* Must have at least enough space for required image header fields */
+	if (buffer_size < (EFX_FIELD_OFFSET(efx_image_header_t, eih_size) +
+		sizeof (header->eih_size))) {
+		rc = ENOSPC;
+		goto fail1;
+	}
+	header = (efx_image_header_t *)bufferp;
+
+	if (header->eih_magic != EFX_IMAGE_HEADER_MAGIC) {
+		rc = EINVAL;
+		goto fail2;
+	}
+
+	/*
+	 * Check image header version is same or higher than lowest required
+	 * version.
+	 */
+	if (header->eih_version < EFX_IMAGE_HEADER_VERSION) {
+		rc = EINVAL;
+		goto fail3;
+	}
+
+	/* Buffer must have space for image header, code and image trailer. */
+	if (buffer_size < (header->eih_size + header->eih_code_size +
+		EFX_IMAGE_TRAILER_SIZE)) {
+		rc = ENOSPC;
+		goto fail4;
+	}
+
+	/* Check CRC from image buffer matches computed CRC. */
+	trailer = (efx_image_trailer_t *)((uint8_t *)header +
+	    header->eih_size + header->eih_code_size);
+
+	crc = efx_crc32_calculate(0, (uint8_t *)header,
+	    (header->eih_size + header->eih_code_size));
+
+	if (trailer->eit_crc != crc) {
+		rc = EINVAL;
+		goto fail5;
+	}
+
+	return (0);
+
+fail5:
+	EFSYS_PROBE(fail5);
+fail4:
+	EFSYS_PROBE(fail4);
+fail3:
+	EFSYS_PROBE(fail3);
+fail2:
+	EFSYS_PROBE(fail2);
+fail1:
+	EFSYS_PROBE1(fail1, efx_rc_t, rc);
+
+	return (rc);
+}
+
+	__checkReturn	efx_rc_t
+efx_check_reflash_image(
+	__in		void			*bufferp,
+	__in		uint32_t		buffer_size,
+	__out		efx_image_info_t	*infop)
+{
+	efx_image_format_t format = EFX_IMAGE_FORMAT_NO_IMAGE;
+	uint32_t image_offset;
+	uint32_t image_size;
+	void *imagep;
+	efx_rc_t rc;
+
+
+	EFSYS_ASSERT(infop != NULL);
+	if (infop == NULL) {
+		rc = EINVAL;
+		goto fail1;
+	}
+	memset(infop, 0, sizeof (*infop));
+
+	if (bufferp == NULL || buffer_size == 0) {
+		rc = EINVAL;
+		goto fail2;
+	}
+
+	/*
+	 * Check if the buffer contains an image in signed format, and if so,
+	 * locate the image header.
+	 */
+	rc = efx_check_signed_image_header(bufferp, buffer_size,
+	    &image_offset, &image_size);
+	if (rc == 0) {
+		/*
+		 * Buffer holds signed image format. Check that the encapsulated
+		 * content is in unsigned image format.
+		 */
+		format = EFX_IMAGE_FORMAT_SIGNED;
+	} else {
+		/* Check if the buffer holds image in unsigned image format */
+		format = EFX_IMAGE_FORMAT_UNSIGNED;
+		image_offset = 0;
+		image_size = buffer_size;
+	}
+	if (image_offset + image_size > buffer_size) {
+		rc = E2BIG;
+		goto fail3;
+	}
+	imagep = (uint8_t *)bufferp + image_offset;
+
+	/* Check unsigned image layout (image header, code, image trailer) */
+	rc = efx_check_unsigned_image(imagep, image_size);
+	if (rc != 0)
+		goto fail4;
+
+	/* Return image details */
+	infop->eii_format = format;
+	infop->eii_imagep = bufferp;
+	infop->eii_image_size = buffer_size;
+	infop->eii_headerp = (efx_image_header_t *)imagep;
+
+	return (0);
+
+fail4:
+	EFSYS_PROBE(fail4);
+fail3:
+	EFSYS_PROBE(fail3);
+fail2:
+	EFSYS_PROBE(fail2);
+	infop->eii_format = EFX_IMAGE_FORMAT_INVALID;
+	infop->eii_imagep = NULL;
+	infop->eii_image_size = 0;
+
+fail1:
+	EFSYS_PROBE1(fail1, efx_rc_t, rc);
+
+	return (rc);
+}
+
+	__checkReturn	efx_rc_t
+efx_build_signed_image_write_buffer(
+	__out		uint8_t			*bufferp,
+	__in		uint32_t		buffer_size,
+	__in		efx_image_info_t	*infop,
+	__out		efx_image_header_t	**headerpp)
+{
+	signed_image_chunk_hdr_t chunk_hdr;
+	uint32_t hdr_offset;
+	struct {
+		uint32_t offset;
+		uint32_t size;
+	} cms_header, image_header, code, image_trailer, signature;
+	efx_rc_t rc;
+
+	EFSYS_ASSERT((infop != NULL) && (headerpp != NULL));
+
+	if ((bufferp == NULL) || (buffer_size == 0) ||
+	    (infop == NULL) || (headerpp == NULL)) {
+		/* Invalid arguments */
+		rc = EINVAL;
+		goto fail1;
+	}
+	if ((infop->eii_format != EFX_IMAGE_FORMAT_SIGNED) ||
+	    (infop->eii_imagep == NULL) ||
+	    (infop->eii_headerp == NULL) ||
+	    ((uint8_t *)infop->eii_headerp < (uint8_t *)infop->eii_imagep) ||
+	    (infop->eii_image_size < EFX_IMAGE_HEADER_SIZE) ||
+	    ((size_t)((uint8_t *)infop->eii_headerp - infop->eii_imagep) >
+	    (infop->eii_image_size - EFX_IMAGE_HEADER_SIZE))) {
+		/* Invalid image info */
+		rc = EINVAL;
+		goto fail2;
+	}
+
+	/* Locate image chunks in original signed image */
+	cms_header.offset = 0;
+	cms_header.size =
+	    (uint32_t)((uint8_t *)infop->eii_headerp - infop->eii_imagep);
+	if ((cms_header.size > buffer_size) ||
+	    (cms_header.offset > (buffer_size - cms_header.size))) {
+		rc = EINVAL;
+		goto fail3;
+	}
+
+	image_header.offset = cms_header.offset + cms_header.size;
+	image_header.size = infop->eii_headerp->eih_size;
+	if ((image_header.size > buffer_size) ||
+	    (image_header.offset > (buffer_size - image_header.size))) {
+		rc = EINVAL;
+		goto fail4;
+	}
+
+	code.offset = image_header.offset + image_header.size;
+	code.size = infop->eii_headerp->eih_code_size;
+	if ((code.size > buffer_size) ||
+	    (code.offset > (buffer_size - code.size))) {
+		rc = EINVAL;
+		goto fail5;
+	}
+
+	image_trailer.offset = code.offset + code.size;
+	image_trailer.size = EFX_IMAGE_TRAILER_SIZE;
+	if ((image_trailer.size > buffer_size) ||
+	    (image_trailer.offset > (buffer_size - image_trailer.size))) {
+		rc = EINVAL;
+		goto fail6;
+	}
+
+	signature.offset = image_trailer.offset + image_trailer.size;
+	signature.size = (uint32_t)(infop->eii_image_size - signature.offset);
+	if ((signature.size > buffer_size) ||
+	    (signature.offset > (buffer_size - signature.size))) {
+		rc = EINVAL;
+		goto fail7;
+	}
+
+	EFSYS_ASSERT3U(infop->eii_image_size, ==, cms_header.size +
+	    image_header.size + code.size + image_trailer.size +
+	    signature.size);
+
+	/* BEGIN CSTYLED */
+	/*
+	 * Build signed image partition, inserting chunk headers.
+	 *
+	 *  Signed Image:                  Image in NVRAM partition:
+	 *
+	 *  +-----------------+            +-----------------+
+	 *  | CMS header      |            |  mcfw.update    |<----+
+	 *  +-----------------+            |                 |     |
+	 *  | reflash header  |            +-----------------+     |
+	 *  +-----------------+            | chunk header:   |-->--|-+
+	 *  | mcfw.update     |            | REFLASH_TRAILER |     | |
+	 *  |                 |            +-----------------+     | |
+	 *  +-----------------+        +-->| CMS header      |     | |
+	 *  | reflash trailer |        |   +-----------------+     | |
+	 *  +-----------------+        |   | chunk header:   |->-+ | |
+	 *  | signature       |        |   | REFLASH_HEADER  |   | | |
+	 *  +-----------------+        |   +-----------------+   | | |
+	 *                             |   | reflash header  |<--+ | |
+	 *                             |   +-----------------+     | |
+	 *                             |   | chunk header:   |-->--+ |
+	 *                             |   | IMAGE           |       |
+	 *                             |   +-----------------+       |
+	 *                             |   | reflash trailer |<------+
+	 *                             |   +-----------------+
+	 *                             |   | chunk header:   |
+	 *                             |   | SIGNATURE       |->-+
+	 *                             |   +-----------------+   |
+	 *                             |   | signature       |<--+
+	 *                             |   +-----------------+
+	 *                             |   | ...unused...    |
+	 *                             |   +-----------------+
+	 *                             +-<-| chunk header:   |
+	 *                             >-->| CMS_HEADER      |
+	 *                                 +-----------------+
+	 *
+	 * Each chunk header gives the partition offset and length of the image
+	 * chunk's data. The image chunk data is immediately followed by the
+	 * chunk header for the next chunk.
+	 *
+	 * The data chunk for the firmware code must be at the start of the
+	 * partition (needed for the bootloader). The first chunk header in the
+	 * chain (for the CMS header) is stored at the end of the partition. The
+	 * chain of chunk headers maintains the same logical order of image
+	 * chunks as the original signed image file. This set of constraints
+	 * results in the layout used for the data chunks and chunk headers.
+	 */
+	/* END CSTYLED */
+	memset(bufferp, buffer_size, 0xFF);
+
+	EFX_STATIC_ASSERT(sizeof (chunk_hdr) == SIGNED_IMAGE_CHUNK_HDR_LEN);
+	memset(&chunk_hdr, 0, SIGNED_IMAGE_CHUNK_HDR_LEN);
+
+	/*
+	 * CMS header
+	 */
+	if (buffer_size < SIGNED_IMAGE_CHUNK_HDR_LEN) {
+		rc = ENOSPC;
+		goto fail8;
+	}
+	hdr_offset = buffer_size - SIGNED_IMAGE_CHUNK_HDR_LEN;
+
+	chunk_hdr.magic		= SIGNED_IMAGE_CHUNK_HDR_MAGIC;
+	chunk_hdr.version	= SIGNED_IMAGE_CHUNK_HDR_VERSION;
+	chunk_hdr.id		= SIGNED_IMAGE_CHUNK_CMS_HEADER;
+	chunk_hdr.offset	= code.size + SIGNED_IMAGE_CHUNK_HDR_LEN;
+	chunk_hdr.len		= cms_header.size;
+
+	memcpy(bufferp + hdr_offset, &chunk_hdr, sizeof (chunk_hdr));
+
+	if ((chunk_hdr.len > buffer_size) ||
+	    (chunk_hdr.offset > (buffer_size - chunk_hdr.len))) {
+		rc = ENOSPC;
+		goto fail9;
+	}
+	memcpy(bufferp + chunk_hdr.offset,
+	    infop->eii_imagep + cms_header.offset,
+	    cms_header.size);
+
+	/*
+	 * Image header
+	 */
+	hdr_offset = chunk_hdr.offset + chunk_hdr.len;
+	if (hdr_offset > (buffer_size - SIGNED_IMAGE_CHUNK_HDR_LEN)) {
+		rc = ENOSPC;
+		goto fail10;
+	}
+	chunk_hdr.magic		= SIGNED_IMAGE_CHUNK_HDR_MAGIC;
+	chunk_hdr.version	= SIGNED_IMAGE_CHUNK_HDR_VERSION;
+	chunk_hdr.id		= SIGNED_IMAGE_CHUNK_REFLASH_HEADER;
+	chunk_hdr.offset	= hdr_offset + SIGNED_IMAGE_CHUNK_HDR_LEN;
+	chunk_hdr.len		= image_header.size;
+
+	memcpy(bufferp + hdr_offset, &chunk_hdr, SIGNED_IMAGE_CHUNK_HDR_LEN);
+
+	if ((chunk_hdr.len > buffer_size) ||
+	    (chunk_hdr.offset > (buffer_size - chunk_hdr.len))) {
+		rc = ENOSPC;
+		goto fail11;
+	}
+	memcpy(bufferp + chunk_hdr.offset,
+	    infop->eii_imagep + image_header.offset,
+	    image_header.size);
+
+	*headerpp = (efx_image_header_t *)(bufferp + chunk_hdr.offset);
+
+	/*
+	 * Firmware code
+	 */
+	hdr_offset = chunk_hdr.offset + chunk_hdr.len;
+	if (hdr_offset > (buffer_size - SIGNED_IMAGE_CHUNK_HDR_LEN)) {
+		rc = ENOSPC;
+		goto fail12;
+	}
+	chunk_hdr.magic		= SIGNED_IMAGE_CHUNK_HDR_MAGIC;
+	chunk_hdr.version	= SIGNED_IMAGE_CHUNK_HDR_VERSION;
+	chunk_hdr.id		= SIGNED_IMAGE_CHUNK_IMAGE;
+	chunk_hdr.offset	= 0;
+	chunk_hdr.len		= code.size;
+
+	memcpy(bufferp + hdr_offset, &chunk_hdr, SIGNED_IMAGE_CHUNK_HDR_LEN);
+
+	if ((chunk_hdr.len > buffer_size) ||
+	    (chunk_hdr.offset > (buffer_size - chunk_hdr.len))) {
+		rc = ENOSPC;
+		goto fail13;
+	}
+	memcpy(bufferp + chunk_hdr.offset,
+	    infop->eii_imagep + code.offset,
+	    code.size);
+
+	/*
+	 * Image trailer (CRC)
+	 */
+	chunk_hdr.magic		= SIGNED_IMAGE_CHUNK_HDR_MAGIC;
+	chunk_hdr.version	= SIGNED_IMAGE_CHUNK_HDR_VERSION;
+	chunk_hdr.id		= SIGNED_IMAGE_CHUNK_REFLASH_TRAILER;
+	chunk_hdr.offset	= hdr_offset + SIGNED_IMAGE_CHUNK_HDR_LEN;
+	chunk_hdr.len		= image_trailer.size;
+
+	hdr_offset = code.size;
+	if (hdr_offset > (buffer_size - SIGNED_IMAGE_CHUNK_HDR_LEN)) {
+		rc = ENOSPC;
+		goto fail14;
+	}
+
+	memcpy(bufferp + hdr_offset, &chunk_hdr, SIGNED_IMAGE_CHUNK_HDR_LEN);
+
+	if ((chunk_hdr.len > buffer_size) ||
+	    (chunk_hdr.offset > (buffer_size - chunk_hdr.len))) {
+		rc = ENOSPC;
+		goto fail15;
+	}
+	memcpy((uint8_t *)bufferp + chunk_hdr.offset,
+	    infop->eii_imagep + image_trailer.offset,
+	    image_trailer.size);
+
+	/*
+	 * Signature
+	 */
+	hdr_offset = chunk_hdr.offset + chunk_hdr.len;
+	if (hdr_offset > (buffer_size - SIGNED_IMAGE_CHUNK_HDR_LEN)) {
+		rc = ENOSPC;
+		goto fail16;
+	}
+	chunk_hdr.magic		= SIGNED_IMAGE_CHUNK_HDR_MAGIC;
+	chunk_hdr.version	= SIGNED_IMAGE_CHUNK_HDR_VERSION;
+	chunk_hdr.id		= SIGNED_IMAGE_CHUNK_SIGNATURE;
+	chunk_hdr.offset	= chunk_hdr.offset + SIGNED_IMAGE_CHUNK_HDR_LEN;
+	chunk_hdr.len		= signature.size;
+
+	memcpy(bufferp + hdr_offset, &chunk_hdr, SIGNED_IMAGE_CHUNK_HDR_LEN);
+
+	if ((chunk_hdr.len > buffer_size) ||
+	    (chunk_hdr.offset > (buffer_size - chunk_hdr.len))) {
+		rc = ENOSPC;
+		goto fail17;
+	}
+	memcpy(bufferp + chunk_hdr.offset,
+	    infop->eii_imagep + signature.offset,
+	    signature.size);
+
+	return (0);
+
+fail17:
+	EFSYS_PROBE(fail17);
+fail16:
+	EFSYS_PROBE(fail16);
+fail15:
+	EFSYS_PROBE(fail15);
+fail14:
+	EFSYS_PROBE(fail14);
+fail13:
+	EFSYS_PROBE(fail13);
+fail12:
+	EFSYS_PROBE(fail12);
+fail11:
+	EFSYS_PROBE(fail11);
+fail10:
+	EFSYS_PROBE(fail10);
+fail9:
+	EFSYS_PROBE(fail9);
+fail8:
+	EFSYS_PROBE(fail8);
+fail7:
+	EFSYS_PROBE(fail7);
+fail6:
+	EFSYS_PROBE(fail6);
+fail5:
+	EFSYS_PROBE(fail5);
+fail4:
+	EFSYS_PROBE(fail4);
+fail3:
+	EFSYS_PROBE(fail3);
+fail2:
+	EFSYS_PROBE(fail2);
+fail1:
+	EFSYS_PROBE1(fail1, efx_rc_t, rc);
+
+	return (rc);
+}
 
 
 
diff --git a/drivers/net/sfc/base/efx.h b/drivers/net/sfc/base/efx.h
index 0d84108..088a896 100644
--- a/drivers/net/sfc/base/efx.h
+++ b/drivers/net/sfc/base/efx.h
@@ -1567,6 +1567,92 @@ efx_bootcfg_write(
 
 #endif	/* EFSYS_OPT_BOOTCFG */
 
+#if EFSYS_OPT_IMAGE_LAYOUT
+
+#include "ef10_signed_image_layout.h"
+
+/*
+ * Image header used in unsigned and signed image layouts (see SF-102785-PS).
+ *
+ * NOTE:
+ * The image header format is extensible. However, older drivers require an
+ * exact match of image header version and header length when validating and
+ * writing firmware images.
+ *
+ * To avoid breaking backward compatibility, we use the upper bits of the
+ * controller version fields to contain an extra version number used for
+ * combined bootROM and UEFI ROM images on EF10 and later (to hold the UEFI ROM
+ * version). See bug39254 and SF-102785-PS for details.
+ */
+typedef struct efx_image_header_s {
+	uint32_t	eih_magic;
+	uint32_t	eih_version;
+	uint32_t	eih_type;
+	uint32_t	eih_subtype;
+	uint32_t	eih_code_size;
+	uint32_t	eih_size;
+	union {
+		uint32_t	eih_controller_version_min;
+		struct {
+			uint16_t	eih_controller_version_min_short;
+			uint8_t		eih_extra_version_a;
+			uint8_t		eih_extra_version_b;
+		};
+	};
+	union {
+		uint32_t	eih_controller_version_max;
+		struct {
+			uint16_t	eih_controller_version_max_short;
+			uint8_t		eih_extra_version_c;
+			uint8_t		eih_extra_version_d;
+		};
+	};
+	uint16_t	eih_code_version_a;
+	uint16_t	eih_code_version_b;
+	uint16_t	eih_code_version_c;
+	uint16_t	eih_code_version_d;
+} efx_image_header_t;
+
+#define	EFX_IMAGE_HEADER_SIZE		(40)
+#define	EFX_IMAGE_HEADER_VERSION	(4)
+#define	EFX_IMAGE_HEADER_MAGIC		(0x106F1A5)
+
+
+typedef struct efx_image_trailer_s {
+	uint32_t	eit_crc;
+} efx_image_trailer_t;
+
+#define	EFX_IMAGE_TRAILER_SIZE		(4)
+
+typedef enum efx_image_format_e {
+	EFX_IMAGE_FORMAT_NO_IMAGE,
+	EFX_IMAGE_FORMAT_INVALID,
+	EFX_IMAGE_FORMAT_UNSIGNED,
+	EFX_IMAGE_FORMAT_SIGNED,
+} efx_image_format_t;
+
+typedef struct efx_image_info_s {
+	efx_image_format_t	eii_format;
+	uint8_t *		eii_imagep;
+	size_t			eii_image_size;
+	efx_image_header_t *	eii_headerp;
+} efx_image_info_t;
+
+extern	__checkReturn	efx_rc_t
+efx_check_reflash_image(
+	__in		void			*bufferp,
+	__in		uint32_t		buffer_size,
+	__out		efx_image_info_t	*infop);
+
+extern	__checkReturn	efx_rc_t
+efx_build_signed_image_write_buffer(
+	__out		uint8_t			*bufferp,
+	__in		uint32_t		buffer_size,
+	__in		efx_image_info_t	*infop,
+	__out		efx_image_header_t	**headerpp);
+
+#endif	/* EFSYS_OPT_IMAGE_LAYOUT */
+
 #if EFSYS_OPT_DIAG
 
 typedef enum efx_pattern_type_t {
