I2C writes is what we do. Gerald
On Tue, Sep 8, 2015 at 4:32 PM, Phil Mills <phil.mi...@gmail.com> wrote: > Gerald, > > I've got the SRM and know the format of the data that needs to get written > there - I'm just stuck on HOW to get it there: > > Could anyone provide* a good set of instructions for getting access to a >> uBoot prompt* from a stock flasher image OR provide current* links to >> the blank-EEPROM manufacturing images* (or equivalents) that RCN's >> referenced? >> > > The two methods I've seen discussed on the forums are: > 1) Manually updating the EEPROM from i2c commands issued within uBoot > 2) Using a flasher image with a uBoot build that bypasses the > magic-number-check and writes content to the EEPROM from a command-line > script. > > > > > On Tuesday, September 8, 2015 at 3:19:29 PM UTC-6, Gerald wrote: >> >> Take a real BBB and copy the contents if you need to. EEPROM data varies >> with serial number and revision data. But the EEPROM data is described in >> the SRM, is still valid and is not stale or old. >> >> Gerald >> >> >> On Tue, Sep 8, 2015 at 4:15 PM, Phil Mills <phil....@gmail.com> wrote: >> >>> I have inherited responsibility for a bunch of 3rd-party direct clones >>> of a Beaglebone Black C5 (only known change is in silkscreening). >>> >>> Since none of these have any contents written to the onboard EEPROM, >>> they fail to boot with "CCCCC" written to the serial console with no uSD >>> card, and >>> >>> >>>> U-Boot SPL 2015.01-00001-gb2412df (Jan 29 2015 - 15:01:06) >>>> Incorrect magic number (0xffffffff) in EEPROM >>>> Could not get board ID. >>>> Incorrect magic number (0xffffffff) in EEPROM >>>> Could not get board ID. >>>> Unknown board, cannot configure pinmux.### ERROR ### Please RESET the >>>> board ### >>> >>> >>> ...written to the console when I try to boot it from a uSD cards with a >>> stock BBB image (the 2015-03-01 Debian 7.8 image). So clearly I need to >>> get some good contents into the EEPROM. >>> >>> >>> I've been trying to hunt down instructions for how to access the U-Boot >>> prompt to manually write the EEPROM via the i2c bus, but haven't hit any >>> luck there. >>> >>> >>> Robert Nelson's posted links in the past to what he's described as the >>> "factory images for flashing boards with blank EEPROMs", but those links >>> (to rcn-ee.org) are stale/dead or behind apparently access-controlled >>> folders on his server. >>> >>> >>> >>> Could anyone provide a good set of instructions for getting access to a >>> uBoot prompt from a stock flasher image OR provide current links to the >>> blank-EEPROM manufacturing images (or equivalents) that RCN's referenced? >>> >>> -- >>> For more options, visit http://beagleboard.org/discuss >>> --- >>> You received this message because you are subscribed to the Google >>> Groups "BeagleBoard" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to beagleboard...@googlegroups.com. >>> For more options, visit https://groups.google.com/d/optout. >>> >> >> >> >> -- >> Gerald >> >> ger...@beagleboard.org >> http://beagleboard.org/ >> > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to beagleboard+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > -- Gerald ger...@beagleboard.org http://beagleboard.org/ -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
