[flashrom] [PATCH 9/10] 4BA: SFDP downgrade to 1.5 to support new Micron chips
Boris Baykov
dev at borisbaykov.com
Sun Jan 11 00:19:54 CET 2015
After I added SFDP 1.6 parser I found in Micron's datasheet
for MT25Q 512Mb chip (MT25QL512AB/MT25QU512AB) that the chip
returnes SFDP revision 1.5 but simultaniously provides the
required information about addressing mode switch, however
all information about direct-4BA functions isn't provided.
I decided to parse new SFDP 4-bytes info from SFDP
revision 1.5 besides of direct-4BA instructions. This
assumption is made for better support of Micron flash chips.
This code should be checked and may be modified or removed.
Patched files
-------------
sfdp.c
+ added fix for Micron chips to read 16th dword stating from SFDP revision 1.5
Signed-off-by: Boris Baykov <dev at borisbaykov.com>, Russia, Jan 2014
---
diff -U 5 -N ./flashrom/sfdp.c ./flashrom-1868-4ba-9/sfdp.c
--- ./flashrom/sfdp.c 2015-01-11 01:55:16.000000000 +0300
+++ ./flashrom-1868-4ba-9/sfdp.c 2015-01-10 21:33:06.000000000 +0300
@@ -19,10 +19,11 @@
*/
/*
* History of changes:
* 05/01/2014 Added compliance to JESD216B standard and SFDP revision 1.6
+ * 07/01/2014 Modified to support SFDP revision 1.5 (for Micron flash chips)
*/
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
@@ -177,11 +178,11 @@
__func__, eraser_type);
return 1;
}
/* Parse of JEDEC SFDP Basic Flash Parameter Table */
-static int sfdp_fill_flash(struct flashchip *chip, uint8_t *buf, uint16_t len, int sfdp_rev_16)
+static int sfdp_fill_flash(struct flashchip *chip, uint8_t *buf, uint16_t len, int sfdp_rev_15)
{
uint8_t opcode_4k_erase = 0xFF;
uint32_t tmp32;
uint8_t tmp8;
uint32_t total_size; /* in bytes */
@@ -296,14 +297,14 @@
total_size = ((tmp32 & 0x7FFFFFFF) + 1) / 8;
chip->total_size = total_size / 1024;
msg_cdbg2(" Flash chip size is %d kB.\n", chip->total_size);
if (total_size > (1 << 24)) {
- if(!sfdp_rev_16) {
+ if(!sfdp_rev_15) {
msg_cdbg("Flash chip size is bigger than what 3-Byte addressing "
"can access but chip's SFDP revision is lower than 1.6 "
- "\nConsequently 4-bytes addressing can NOT be "
+ "(1.5).\nConsequently 4-bytes addressing can NOT be "
"properly configured using current SFDP information.\n");
#ifndef FBA_USE_EXT_ADDR_REG_BY_DEFAULT
msg_cdbg("Assuming that 4-bytes addressing mode can be "
"entered by CMD B7h with WREN.\n");
#else
@@ -374,14 +375,14 @@
because we don't have to know how to switch to 4-bytes mode and back
when we are already in 4-bytes mode permanently. */
if (chip->feature_bits & FEATURE_4BA_ONLY)
goto done;
- /* If the SFDP revision supported by the chip is lower that 1.6
+ /* If the SFDP revision supported by the chip is lower that 1.6 (1.5)
we can not read and analyze 16th DWORD of Basic Flash Parameter Table.
Using defaults by FBA_USE_EXT_ADDR_REG_BY_DEFAULT define. */
- if(!sfdp_rev_16)
+ if(!sfdp_rev_15)
goto done;
if (len < 16 * 4) {
msg_cdbg("%s: len of BFPT is out of spec\n", __func__);
msg_cerr("ERROR: Unable read 4-bytes addressing parameters.\n");
@@ -600,11 +601,11 @@
/* need to limit the table loop by comparing i to uint8_t nph hence: */
uint16_t i;
struct sfdp_tbl_hdr *hdrs;
uint8_t *hbuf;
uint8_t *tbuf;
- int sfdp_rev_16 = 0;
+ int sfdp_rev_16 = 0, sfdp_rev_15 = 0;
if (spi_sfdp_read_sfdp(flash, 0x00, buf, 4)) {
msg_cdbg("Receiving SFDP signature failed.\n");
return 0;
}
@@ -634,12 +635,29 @@
/* JEDEC JESD216B defines SFDP revision 1.6 and includes:
1) 16 dwords in Basic Flash Parameter Table
2) 16th dword has information how to enter
and exit 4-bytes addressing mode
3) 4-Bytes Address Instruction Table with ID 0xFF84
+
+ However we can see in the datasheet for Micron's
+ MT25Q 512Mb chip (MT25QL512AB/MT25QU512AB) that the
+ chip returnes SFDP revision 1.5 and has 16 dwords
+ in its Basic Flash Paramater Table. Also the information
+ about addressing mode switch is exist in the 16th dword.
+ But 4-Bytes Address Instruction Table is absent.
+
+ So we will use 16th dword from SFDP revision 1.5
+ but 4-Bytes Address Instruction Table from SFDP 1.6 only.
+ This assumption is made for better support of Micron
+ flash chips.
+
+ FIXME: SFDP revisions compliance should be checked
+ more carefully after more information about JESD216B
+ SFDP tables will be known from real flash chips.
*/
sfdp_rev_16 = (buf[1] == 1 && buf[0] >= 6) || buf[1] > 1;
+ sfdp_rev_15 = (buf[1] == 1 && buf[0] >= 5) || buf[1] > 1;
nph = buf[2];
msg_cdbg2("SFDP number of parameter headers is %d (NPH = %d).\n",
nph + 1, nph);
@@ -715,21 +733,21 @@
"parameter table is not 0xFF00 as"
"demanded by JESD216 (warning only)."
"\n");
#ifdef JESD216B_SIMULATION
if(!sfdp_jesd216b_simulation_dw16(&tbuf, &len))
- sfdp_rev_16 = 1; /* pretend as SFDP rev 1.6 */
+ sfdp_rev_16 = sfdp_rev_15 = 1; /* pretend as SFDP rev 1.6 */
#endif
if (hdrs[i].v_major != 0x01) {
msg_cdbg("The chip contains an unknown "
"version of the JEDEC flash "
"parameters table, skipping it.\n");
} else if (len != 16 * 4 && len != 9 * 4 && len != 4 * 4) {
msg_cdbg("Length of the mandatory JEDEC SFDP "
"parameter table is wrong (%d B), "
"skipping it.\n", len);
- } else if (sfdp_fill_flash(flash->chip, tbuf, len, sfdp_rev_16) == 0)
+ } else if (sfdp_fill_flash(flash->chip, tbuf, len, sfdp_rev_15) == 0)
ret = 1;
#ifdef JESD216B_SIMULATION
if(ret == 1 && !sfdp_jesd216b_simulation_4bait(&tbuf, &len))
sfdp_parse_4ba_table(flash->chip, tbuf, len);
#endif
-------------- next part --------------
A non-text attachment was scrubbed...
Name: flashrom-r1868-4ba-part-9.patch.tar.bz2
Type: application/octet-stream
Size: 2561 bytes
Desc: not available
URL: <http://www.flashrom.org/pipermail/flashrom/attachments/20150111/db51e122/attachment.obj>
More information about the flashrom
mailing list