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 250 (ns*100) at CAS 6 Maximum Access Time 4 (ns*10) at CAS 6 Maximum Cycle Time (tCK max) 8 ns ---=== Timing Parameters ===--- Address/Command Setup Time Before Clock (tIS) 17 (ns*100) Address/Command Hold Time After Clock (tIH) 25 (ns*100) Data Input Setup Time Before Strobe (tDS) 5 (ns*100) Data Input Hold Time After Strobe (tDH) 12 (ns*100) Minimum Row Precharge Delay (tRP) 150 (ns*10) Minimum Row Active to Row Active Delay (tRRD) 75 (ns*10) Minimum RAS# to CAS# Delay (tRCD) 150 (ns*10) Minimum RAS# Pulse Width (tRAS) 450 (ns*10) Write Recovery Time (tWR) 150 (ns*10) Minimum Write to Read CMD Delay (tWTR) 75 (ns*10) Minimum Read to Pre-charge CMD Delay (tRTP) 75 (ns*10) Minimum Active to Auto-refresh Delay (tRC) 600 (ns*10) Minimum Recovery Delay (tRFC) 1270 (ns*10) Maximum DQS to DQ Skew (tDQSQ) 20 (ns*100) Maximum Read Data Hold Skew (tQHS) 30 (ns*100) ---=== 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 | 65 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 73 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..80da80c --- /dev/null +++ b/commands/decode.c @@ -0,0 +1,65 @@ +#include <fcntl.h> +#include <common.h> +#include <getopt.h> +#include <command.h> +#include <envfs.h> +#include <errno.h> +#include <fs.h> +#include <libfile.h> +#include <malloc.h> +#include <globalvar.h> +#include <stdlib.h> +#include <stdio.h> +#include <ddr_spd.h> + +void dump(uint8_t *addr, int len) +{ + int i; + + printf("\t 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f\n\n"); + + for (i = 0; i < len; i++) { + if ((i % 0x10) == 0x00) { + printf("%07x:", i); + } + printf(" %02x", addr[i]); + if ((i % 0x10) == 0xf) { + printf("\n"); + } + } + + printf("\n"); +} + +static int do_decode(int argc, char *argv[]) +{ + int fp; + uint8_t record[256]; + + if (argc != 2) { + return COMMAND_ERROR_USAGE; + } + + fp = open(argv[1], O_RDONLY); + + if (fp < 0) { + printf("could not open %s: %s\n", argv[args], errno_str()); + } + + read(fp, &record[0], 256); + close(fp); + + printf("Decoding EEPROM: %s\n\n", argv[1]); + + prin(record); + printf("\n\n"); + + 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_END -- 2.1.4 _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
