Hi Yaron, its very interesting why MOSI voltage is low. Have you tried disconnecting the peripheral devices like RAM ? about Bus Pirate - which firmware you have? (Bus Pirate old firmware is not good quality, its much more stable if you flash a new "Community Firmware" to it - github BusPirate/Bus_Pirate ) Also please try getting CH341A - it is very cheap flasher which should be reliable thanks to its' simplicity. Another idea: there are small circuit boards called " Step-Up Voltage Regulator " - some versions of them convert 0.5-3.3V to 3.3V --- however if you increase the voltage, it would be less current (maybe not enough to transmit a signal). Still I really hope that you could flash it without complicating a setup by adding the new boards... Best regards, Ivan
2017-11-24 17:56 GMT+03:00 Yaron Shragai <yshragai.firmw...@gmail.com>: > Thank you Ivan. > > As I mentioned, I did try with/without the board plugged in, and > with/without the VCC pin connected to the programmer. (I also tried, on an > identical board that still has a booting BIOS, powering it on to a point > that likely has no BMC traffic.) > > One thing that we have determined, using a scope, is that the VCC pin does > likely get appropriate voltage, but the signals on the MOSI pin are not at a > high enough voltage: The voltage at the MOSI pin, when signals are being > sent, is about 1/2 VCC. This explains why it almost always isn't successful > at finding the chip, but every once in a while, on a rare occasion, it is. > So now the question is, why is the voltage on the MOSI pin too low - what is > pulling it down. > > I'm getting identical results with both the Dediprog SF100 and a Bus Pirate > (not sure which version). And I did try the trick on the Bus Pirate where > you apply the VCC voltage to the Bus Pirate's VUP (pull-up voltage) pin, and > used the flashrom argument to turn on the pull-ups. > > Thanks, > Yaron > > > On Wed, Nov 22, 2017 at 10:29 AM, Ivan Ivanov <qmaster...@gmail.com> wrote: >> >> Hi Yaron, please read about the In-System Programming. It could be >> that the peripheral devices of your motherboard are consuming some >> percentage of the power that was aimed to power a BIOS chip during the >> access - because of that, there is not enough power for a BIOS chip >> and your attempts are failing. What to do: >> >> I) You could try to reduce the amount of peripheral devices - e.g. >> disconnect the RAM modules from your system and try again >> >> II) Also you can try to power a BIOS chip by the motherboard : >> 1) disconnect a VCC wire from your programmer, also disconnect WP and >> HOLD just in case >> 2) disconnect all the boot devices from your motherboard >> 3) connect a clip to a BIOS chip >> 4) connect a power adapter to your motherboard and turn it on >> 5) just in case, wait 5 minutes so that all the initialization >> processes will be completed >> 6) read the contains of a BIOS chip a few times >> 7) compare the checksums of read files, if they are the same - erase >> the BIOS chip (by filling it with FF's), turn off the motherboard, >> then turn it on again, wait 5 minutes - then flash your desired binary >> image to this BIOS chip >> >> III) Alternatively you may want to de-solder a BIOS chip from >> motherboard and connect it to your programmer with DIP adapter, but >> probably could be avoided if you do I) or II) successfully >> >> IV) Try a different programmer, e.g. CH341A which is super cheap >> simple hardware fully supported by flashrom - should be reliable >> >> I wish you good luck, sadly Supermicro X10DRT-Lis not supported by >> coreboot open source BIOS - hopefully you will be able to get a better >> hardware one day... >> >> Best regards, >> >> 2017-11-21 17:57 GMT+03:00 Yaron Shragai <yshragai.firmw...@gmail.com>: >> > Hello, >> > I am trying to use flashrom to program a Winbond W25Q128FV chip, on a >> > Supermicro X10DRT-L mobo, with a Dediprog SF 100. >> > >> > I am running flashrom from an Ubuntu VM on a Win10 laptop as well as >> > from a >> > Minnowboard Max system running Ubuntu. >> > I am running flashrom v0.9.9-rc1-r1942, installed via apt. >> > I am connecting to the chip via a SOIC clip. >> > >> > I should note that I have looked at the product support data on the >> > flashrom >> > web site. It lists full support for the W25Q128FV. It does not list >> > the >> > X10DRT-L mobo. >> > >> > flashrom almost never "sees" the flash chip (output: "No EEPROM/flash >> > device >> > found."). >> > >> > I say "almost", b/c it did see it a couple of times (out of, I would >> > say, >> > ~100 tries) - which was enough for me to read out the pre-existing >> > content, >> > and write to it an image that has effectively bricked it. :-) So, now >> > I'm >> > trying to flash the pre-existing content back... (There is no >> > documented >> > way to force the X10DRT-L to use the recovery block, and I have yet to >> > find >> > an undocumented way...) >> > >> > I have tried with the system board plugged in and unplugged, and with >> > and >> > without connecting the VCC pin to the programmer. >> > >> > I have been using these two command lines, at various times: >> > flashrom -p dediprog >> > flashrom -p dediprog:voltage=3.5 >> > >> > When I add -VVV, the following relevant lines appear in the output: >> > >> > Probing for Winbond W25Q128.V, 16384 kB: programmer_map_flash_region: >> > mapping W25Q128.V from 0x00000000ff000000 to 0x0000000000000000 >> > dediprog_spi_send_command, writecnt=1, readcnt=3 >> > RDID returned 0xff 0xff 0xff. RDID byte 0 parity violation. >> > probe_spi_rdid_generic: id1 0xff, id2 0xffff >> > programmer_unmap_flash_region: unmapped 0x0000000000000000 >> > >> > ...and further down... >> > >> > Probing for Winbond unknown Winbond (ex Nexcom) SPI chip, 0 kB: >> > dediprog_spi_send_command, writecnt=1, readcnt=3 >> > RDID returned 0xff 0xff 0xff. RDID byte 0 parity violation. >> > probe_spi_rdid_generic: id1 0xff, id2 0xffff >> > >> > One more datapoint: When I connect my laptop -> Dediprog -> to the flash >> > chip on the Minnowboard Max (Micron 25Q064A), it does recognize the >> > chip. >> > >> > Any advice would be appreciated! >> > >> > Thanks, >> > Yaron >> > >> > _______________________________________________ >> > flashrom mailing list >> > flashrom@flashrom.org >> > https://mail.coreboot.org/mailman/listinfo/flashrom > > _______________________________________________ flashrom mailing list flashrom@flashrom.org https://mail.coreboot.org/mailman/listinfo/flashrom
