decode-dimms perl script is used as prototype (see https://github.com/groeck/i2c-tools/blob/master/eeprom/decode-dimms). Here is a sample decode output: barebox@barebox sandbox:/ decode env/crucial_pc2-6400_ddr2 Decoding EEPROM: env/crucial_pc2-6400_ddr2 ---=== SPD EEPROM Information ===--- EEPROM Checksum of bytes 0-62 OK (0xCA) Total number of bytes in EEPROM 256 Fundamental Memory type DDR2 SDRAM SPD Revision 1.3 ---=== Memory Characteristics ===--- Maximum module speed 800 MHz (PC2-6400) Size 1024 MB Banks x Rows x Columns x Bits 8 x 14 x 10 x 64 Ranks 1 SDRAM Device Width 8 bits Module Height 30.0 mm Module Type SO-DIMM (67.6 mm) DRAM Package Planar Voltage Interface Level SSTL 1.8V Module Configuration Type No Parity Refresh Rate Reduced (7.8 us) - Self Refresh Supported Burst Lengths 4, 8 Supported CAS Latencies (tCL) 6T tCL-tRCD-tRP-tRAS 6-6-6-18 as DDR2-800 Minimum Cycle Time 2.5 ns at CAS 6 Maximum Access Time 0.40 ns at CAS 6 Maximum Cycle Time (tCK max) 8 ns ---=== Timing Parameters ===--- Address/Command Setup Time Before Clock (tIS) 0.17 ns Address/Command Hold Time After Clock (tIH) 0.25 ns Data Input Setup Time Before Strobe (tDS) 0.05 ns Data Input Hold Time After Strobe (tDH) 0.12 ns Minimum Row Precharge Delay (tRP) 15.0 ns Minimum Row Active to Row Active Delay (tRRD) 7.5 ns Minimum RAS# to CAS# Delay (tRCD) 15.0 ns Minimum RAS# Pulse Width (tRAS) 45 ns Write Recovery Time (tWR) 15.0 ns Minimum Write to Read CMD Delay (tWTR) 7.5 ns Minimum Read to Pre-charge CMD Delay (tRTP) 7.5 ns Minimum Active to Auto-refresh Delay (tRC) 60 ns Minimum Recovery Delay (tRFC) 127 ns Maximum DQS to DQ Skew (tDQSQ) 0.20 ns Maximum Read Data Hold Skew (tQHS) 0.30 ns ---=== Manufacturing Information ===--- Manufacturer JEDEC ID 7f 7f 7f 7f 7f 9b 00 00 Part Number CT12864AC800.M8FM8 Manufacturing Date 2014-W24 Assembly Serial Number 0x00000000 TODOs: * Timing Parameters section output format is slightly differ from decode-dimms' format; * supports only DDR2 SPD EEPROM. Signed-off-by: Alexander Smirnov <alllecs@xxxxxxxxx> --- commands/Kconfig | 7 +++++++ commands/Makefile | 1 + commands/decode.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 61 insertions(+) diff --git a/commands/Kconfig b/commands/Kconfig index bb6674e..9230873 100644 --- a/commands/Kconfig +++ b/commands/Kconfig @@ -2102,6 +2102,13 @@ config CMD_STATE depends on STATE prompt "state" +config CMD_DECODE + tristate + prompt "decode" + select DDR_SPD + help + decode spd eeprom + # end Miscellaneous commands endmenu diff --git a/commands/Makefile b/commands/Makefile index 3698347..71cd877 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_DECODE) += decode.o diff --git a/commands/decode.c b/commands/decode.c new file mode 100644 index 0000000..f8e7264 --- /dev/null +++ b/commands/decode.c @@ -0,0 +1,53 @@ +/* + * 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. + * + * Copyright (C) 2015 Alexander Smirnov <alllecs@xxxxxxxxx> + * + * Originally from https://github.com/groeck/i2c-tools/blob/master/eeprom/decode-dimms + */ + +#include <common.h> +#include <command.h> +#include <libfile.h> +#include <malloc.h> +#include <ddr_spd.h> + +static int do_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); + printf("\n\n"); + + free(data); + + return 0; +} + +BAREBOX_CMD_HELP_START(decode) +BAREBOX_CMD_HELP_TEXT("Not enough or more than one argument to continue.") +BAREBOX_CMD_HELP_END + +BAREBOX_CMD_START(decode) + .cmd = do_decode, + BAREBOX_CMD_HELP(cmd_decode_help) +BAREBOX_CMD_END -- 2.1.4 _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
