On Wed, Jun 24, 2015 at 03:57:29PM +0300, Alexander Smirnov wrote: > 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); read_file_2 is your friend here. It reads a file into an allocated buffer. Sascha -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
