[PATCH 3/3] commands: add spd_decode command
Alexander Smirnov
alllecs at yandex.ru
Fri Jul 3 08:58:25 PDT 2015
spd_decode command is used for decoding and printing
in human-readable format the information found
in memory module SPD EEPROMs.
There is the decode-dimms program from i2c-tools linux
package (see http://www.lm-sensors.org/wiki/I2CTools)
just for the same purpose.
Though spd_decode source code is based on decode-dimms
perl code there is a difference.
Timing Parameters section output format is slightly
differ from decode-dimms' format; to check the difference:
1. patch defaultenv-2-base/bin/init
--- a/defaultenv/defaultenv-2-base/bin/init
+++ b/defaultenv/defaultenv-2-base/bin/init
@@ -1,5 +1,8 @@
#!/bin/sh
+spd_decode /dev/spd
+reset
+
export PATH=/env/bin
global hostname
and compile sandbox barebox.
2. use this script to check decode-dimms vs spd_decode output:
NAME=$1
HEXNAME=${NAME}.hex
ADDR1=${NAME}_decode_perl
ADDR2=${NAME}_decode_c
if [ -z "$NAME" ]; then
echo "Enter the name of the binary file"
exit 1
fi
xxd ${NAME} ${HEXNAME}
${I2CTOOLS_PATH}/eeprom/decode-dimms -x ${HEXNAME} > ${ADDR1}
${BAREBOX_PATH}/barebox --image=spd=${NAME} | sed -n '1,13!p' > ${ADDR2}
diff -u -w ${ADDR1} ${ADDR2}
Sample script output fragment:
@@ -40,22 +18,11 @@
Module Configuration Type No Parity
Refresh Rate Reduced (7.8 us) - Self Refresh
Supported Burst Lengths 4, 8
-Supported CAS Latencies (tCL) 5T, 4T, 3T
+Supported CAS Latencies (tCL) 5T
tCL-tRCD-tRP-tRAS 5-5-5-15 as DDR2-666
- 4-4-4-12 as DDR2-533
- 3-3-3-9 as DDR2-400
-Minimum Cycle Time 3.00 ns at CAS 5 (tCK min)
- 3.75 ns at CAS 4
- 5.00 ns at CAS 3
-Maximum Access Time 0.45 ns at CAS 5 (tAC)
- 0.50 ns at CAS 4
- 0.60 ns at CAS 3
-Maximum Cycle Time (tCK max) 8.00 ns (DDR2-250)
-
----=== Timings at Standard Speeds ===---
-tCL-tRCD-tRP-tRAS as DDR2-666 5-5-5-15
-tCL-tRCD-tRP-tRAS as DDR2-533 4-4-4-12
-tCL-tRCD-tRP-tRAS as DDR2-400 3-3-3-9
+Minimum Cycle Time 3.0 ns at CAS 5
+Maximum Access Time 0.45 ns at CAS 5
+Maximum Cycle Time (tCK max) 8 ns
---=== Timing Parameters ===---
Address/Command Setup Time Before Clock (tIS) 0.20 ns
@@ -70,14 +37,14 @@
Minimum Write to Read CMD Delay (tWTR) 7.50 ns
Minimum Read to Pre-charge CMD Delay (tRTP) 7.50 ns
Minimum Active to Auto-refresh Delay (tRC) 60.00 ns
-Minimum Recovery Delay (tRFC) 127.50 ns
+Minimum Recovery Delay (tRFC) 127 ns
Maximum DQS to DQ Skew (tDQSQ) 0.24 ns
Maximum Read Data Hold Skew (tQHS) 0.34 ns
---=== Manufacturing Information ===---
-Manufacturer Undefined
+Manufacturer JEDEC ID ff ff ff ff ff ff ff ff
+Manufacturing Location Code 0xff
Part Number GU331G0AJEPR612L4C
-Revision Code 0x4200
-
-
-Number of SDRAM DIMMs detected and decoded: 1
+Manufacturing Date 200-W0
+Assembly Serial Number 0x00000000
+add spd backed by file images/undefined_pc2-5300_ddr2
Signed-off-by: Alexander Smirnov <alllecs at yandex.ru>
---
commands/Kconfig | 7 ++++++
commands/Makefile | 1 +
commands/spd_decode.c | 63 +++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 71 insertions(+)
diff --git a/commands/Kconfig b/commands/Kconfig
index bb6674e..5571902 100644
--- a/commands/Kconfig
+++ b/commands/Kconfig
@@ -2102,6 +2102,13 @@ config CMD_STATE
depends on STATE
prompt "state"
+config CMD_SPD_DECODE
+ tristate
+ prompt "spd_decode"
+ select DDR_SPD
+ help
+ decode spd eeprom
+
# end Miscellaneous commands
endmenu
diff --git a/commands/Makefile b/commands/Makefile
index 3698347..13dbde5 100644
--- a/commands/Makefile
+++ b/commands/Makefile
@@ -112,3 +112,4 @@ obj-$(CONFIG_CMD_NV) += nv.o
obj-$(CONFIG_CMD_DEFAULTENV) += defaultenv.o
obj-$(CONFIG_CMD_STATE) += state.o
obj-$(CONFIG_CMD_DHCP) += dhcp.o
+obj-$(CONFIG_CMD_SPD_DECODE) += spd_decode.o
diff --git a/commands/spd_decode.c b/commands/spd_decode.c
new file mode 100644
index 0000000..2bedcf0
--- /dev/null
+++ b/commands/spd_decode.c
@@ -0,0 +1,63 @@
+/*
+ * This program is decoding and printing SPD contents
+ * in human readable format
+ * As an argument program, you must specify the file name.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL ALTERA CORPORATION BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+ * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Copyright (C) 2015 Alexander Smirnov <alllecs at yandex.ru>
+ */
+
+#include <common.h>
+#include <command.h>
+#include <libfile.h>
+#include <malloc.h>
+#include <ddr_spd.h>
+
+static int do_spd_decode(int argc, char *argv[])
+{
+ int ret;
+ size_t size;
+ void *data;
+
+ if (argc != 2)
+ return COMMAND_ERROR_USAGE;
+
+ ret = read_file_2(argv[1], &size, &data, 256);
+ if (ret && ret != -EFBIG) {
+ printf("unable to read %s: %s\n", argv[1], strerror(-ret));
+ return COMMAND_ERROR;
+ }
+
+ printf("Decoding EEPROM: %s\n\n", argv[1]);
+ ddr_spd_print(data);
+
+ free(data);
+
+ return 0;
+}
+
+BAREBOX_CMD_HELP_START(spd_decode)
+BAREBOX_CMD_HELP_TEXT("Decode a SPD EEPROM and print contents in human readable form")
+BAREBOX_CMD_HELP_END
+
+BAREBOX_CMD_START(spd_decode)
+ .cmd = do_spd_decode,
+ BAREBOX_CMD_DESC("Decode SPD EEPROM")
+ BAREBOX_CMD_OPTS("FILE")
+ BAREBOX_CMD_HELP(cmd_spd_decode_help)
+BAREBOX_CMD_END
--
2.1.4
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