OK, well, I did not quite get the answers I hoped for. So here go my comments:
On Thu, Oct 1, 2009 at 5:04 PM, ron minnich <[email protected]> wrote: > dimm 50 > 00: bad device: 01 > > > dimm 51 > 00: bad device: 01 > > > dimm 52 > 00: bad device: 01 > > > dimm 53 > 00: bad device: 01 > > obviously bad. > dimm 54 > 00: ad db de c0 01 00 00 00 01 f0 fa fa 00 00 00 d9 Bogus, because the first byte is "how many bytes written". I went to http://en.wikipedia.org/wiki/Serial_presence_detect#On_older_equipment and is is clear that 0xad doesn't match what's written: > 10: 00 00 00 00 00 00 6c 01 00 00 00 00 00 00 00 00 > etc. > f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 So this is bogus. > > dimm 55 > 00: bad device: 01 > > > dimm 56 > 00: bad device: 01 > > bad. > dimm 57 > 00: 80 08 08 0d 0a 60 48 00 05 50 60 02 02 08 08 00 > 10: 0c 04 38 00 01 00 01 50 60 50 60 3c 1e 3c 28 40 > 20: 35 47 15 27 3c 28 1e 00 00 37 4b 80 23 2d 0f 00 > 30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 10 6b > 40: ce 00 00 00 00 00 00 00 01 4d 33 20 39 33 54 33 > 50: 32 35 33 46 5a 30 2d 43 43 43 20 30 46 05 17 46 > 60: 04 cb 50 00 59 42 43 35 36 30 50 00 00 00 00 00 > 70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > 80: 00 49 d6 06 71 16 23 33 80 30 45 52 00 07 05 ff > 90: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff > a0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff > b0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff > c0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff > d0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff > e0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff > f0: 01 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff > This looks closer to real. 0x80 is a common first byte. It also matches (almost) the # bytes written since the last 112 bytes of this one are pretty clearly unwritten. Let's dig deeper. Byte ordering for the first several bytes: Defines # bytes written into serial memory at module mfgr Total # bytes of SPD memory device Fundamental memory type (FPM, EDO, SDRAM...) from appendix A # Row Addresses on this assembly # Column Addresses on this assembly # Module Banks on this Assembly Data Width of this assembly... ...Data Width continuation Voltage interface standard of this assembly next bytes are 08 and 08. Oops. Byte 2 is the type and 8 doesn't match any type. Disappointing as some of the other bytes almost look plausible, but 0x60 module banks? Doubtful ... Time to break out the lm sensors tools ... and do the gpio dance again. thanks ron -- coreboot mailing list: [email protected] http://www.coreboot.org/mailman/listinfo/coreboot
