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@xxxxxxxxx> --- 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@xxxxxxxxx> + */ + +#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 _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
