Thanks you for your answers, finally i use decode-dimms for check value because i have an spb binary with others reference component very close, i had compare with documentation.
Be careful: Only problems, the input file of decode-dimms take output hexdump -C exactly ( with numbers line ) else decode-dimms doesn't work. thank you for your contribution. 2016-12-17 13:51 GMT+01:00 Pok Gu <[email protected]>: > The difficulty with calculating by hand is there are some checksum bits. > If your goal is to overclock the ram to maximize its performance, you > probably have to do it again and again for servel times so that the ram > reaches its best performance without failing the memtest (the higher the > speed the more likely to fail the memtest). Without a tool or a script the > checksum bits has to be calculated everytime by hand...I am calling for a > tool to make this eaiser... > > Possibly you don't need to invest extra money (but just some time) to use > that tool. Thaiphoon Burner has a free version that it does not allow you > to save the spd.bin but it has a hex editor that can show you the modified > hex bits and the calculated checksum. It can be used as a reference. Then > manually modify the spd.bin file and write it using some free tools (e.g., > RWEveryting on Windows or eeprom/i2c-tool on Linux). > > 2016-12-17 5:21 GMT+08:00 David Hendricks <[email protected]>: > >> >> On Fri, Dec 16, 2016 at 11:01 AM, Pok Gu <[email protected]> wrote: >> >>> Thaiphoon Burne is the most popular and probably the only tool for >>> modifying the spd.bin. It has many built-in templates and you only need to >>> select the speed, clocking, and voltage you like (e.g., DDR3-1688/DDR3-1333 >>> and CL10/CL11 and 1.35V/1.5V) and it will do all the rest calculations and >>> generate the spd.bin for you. Then, the only thing you need to do is to >>> flash the spd.bin to the spd chip on the ram, and reboot, and your ram >>> stick is overclocked. >>> >>> Unfortunately, it is only available on Windows. So I have one harddisk >>> loaded with Windows 7 and Thaiphoon Burne specialized for this work. >>> >>> I haven't found any linux software can do this unless you calculate and >>> modify the spd.bin by hand. (If anyone found one let me know) >>> >> >> Cool - I never knew about that tool. Seems like a good investment if the >> goal is to generate an spd.bin from scratch. >> >> Sebastien - What are you trying to do, exactly? If you only need to >> change one or two parameters, then a hex editor and a calculator should be >> sufficient. The relevant specification for SPDs is JEDEC Standard No. 21-C >> Annex K for DDR3 and Annex L for DDR4. (you'll need to register with >> jedec.org to download the specs) >> >> -- >> David Hendricks (dhendrix) >> Systems Software Engineer, Google Inc. >> > > -- Sébastien Basset
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