I'm using the 3B+ and a tiny usb flash. It handles unexpected power cycles fine, unlike the sd card. Booting a 4B off usb is more difficult I believe, but my only 4B seems to be dead, so I'm progressing with the 3B+.
-- Ralph On Jan 12, 2021 8:49 PM, Thaddeus Waldner <thadw...@gmail.com> wrote: CAUTION: This email originated from outside the Walla Walla University email system. I’m wondering what you plan to use for flash memory on the Pi. Is the SD card a viable solution in this application? Would the Pi compute module with onboard flash memory be a workable solution? One issue with onboard flash memory is that swapping out a pi in the case of a processor failure would be more difficult. Is there anything else that makes the compute modules a worse choice than the standard pi? Of course this is just me wishing someone would hook up a basic MESA card with the Pi4 compute module headers. > On Jan 12, 2021, at 2:33 PM, Ralph Stirling <ralph.stirl...@wallawalla.edu> > wrote: > > Success at last! > > To summarize everything I've learned: > - I was missing one ground (RPi pin 14) > - mesaflash doesn't tell me that I have to > use --device 7i90, not 7i90hd. I had to > look at the mesaflash source to figure that out. > - my Fluke 179 dvm diode check does not > give me ~0.7v readings for fpga pins > - I have to load the spi bit file with jtag > > I now have native RPi jtag using openocd > working, so don't need the $50 Digilent > HS2 dongle any more. I edited the > raspberrypi-native.cfg file to move the > gpio pins from 11,25,10,9 to 17,27,22,5 > to avoid conflict with the 7i90's SPI pins. > > I will spin another version of my little adapter > shim pcb to include the jtag header. I'll be > happy to share that design with the group > when I get them back and tested. > > Thank you again! > -- Ralph > > >> Is there anything that needs to be done >> differently on the RPi 3b+ to communicate >> with the 7i90 via spi versus the 7c81? > > It should be identical, and AFAIK the mesaflash interface > should be less picky since it runs at a lower clock speed > than the default hm2-rpspi driver > > Are all RPI grounds connected to all 7I90 26 pin > header grounds? > > >> >> Is the next step to cobble up some vhdl to >> verify all the pins on the spi interface side >> are functioning? I suppose somewhere along >> the line I might have blown a pin. > > > If you blow a pin, it will usually show as the > protection diode being damaged. You can check > this with a DVMs diode check function. Connect > the DVMs positive lead to 7I90 ground and check > the diode voltage drop on the SPI leads, they should > all be ~.7V > >> > >> I'd really like to get this working, as I'm putting >> together a standard package I can use for all >> our custom controllers for machines and instruments. >> Bioprinters, syringe pumps, bioreactors, routers, >> pick & place, hotwire foam cutters. I'm tired of >> random castoff pc's. >> >> Thanks again, >> -- Ralph >> ________________________________________ >> From: Peter C. Wallace [p...@mesanet.com] >> Sent: Monday, January 11, 2021 4:34 PM >> To: Enhanced Machine Controller (EMC) >> Subject: Re: [Emc-users] Rpi 3b+ to 7i90hd >> >> CAUTION: This email originated from outside the Walla Walla University email >> system. >> >> >>> On Mon, 11 Jan 2021, Ralph Stirling wrote: >>> >>> Date: Mon, 11 Jan 2021 23:48:56 +0000 >>> From: Ralph Stirling <ralph.stirl...@wallawalla.edu> >>> Reply-To: "Enhanced Machine Controller (EMC)" >>> <emc-users@lists.sourceforge.net> >>> To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> >>> Subject: Re: [Emc-users] Rpi 3b+ to 7i90hd >>> >>> I've made a bit of progress now. I found a Digilent HS2 >>> jtag dongle, and got to the point of (apparently) successfully >>> loading an SPI bitstream to the 7I90 (chose 7i90_spi_svst4_8.bit). >>> >>> Running: >>> >>> $ mesaflash --device 7i90hd --addr /dev/spidev0.0 --spi --readhmid >>> >>> gives me the same "no 7I90HD board found" error though. I tried >>> adding a pullup resistor to the SDO pin, without change, which >>> would seem to indicate the 7I90HD is actively driving it low. >>> >>> Is there a very simple blinky bitstream I can try loading to >>> be sure the jtag loading is successful? The /INIT yellow led >>> flashes briefly, and /DONE red led does go on during the load >>> and goes off afterward. >>> >>> Thanks again. >>> -- Ralph >> >> >> Theres no blinky light test bitfile but if you load the sserial >> remote bitfile 7i90_ssremote.bit, The init LED should light once >> configured (well 50 ms after configured indicating a watchdog timeout) >> >>> ________________________________________ >>> From: Peter C. Wallace [p...@mesanet.com] >>> Sent: Friday, January 8, 2021 1:22 PM >>> To: Enhanced Machine Controller (EMC) >>> Subject: Re: [Emc-users] Rpi 3b+ to 7i90hd >>> >>> CAUTION: This email originated from outside the Walla Walla University >>> email system. >>> >>> >>>> On Fri, 8 Jan 2021, Ralph Stirling wrote: >>> >>>> Date: Fri, 8 Jan 2021 21:08:55 +0000 >>>> From: Ralph Stirling <ralph.stirl...@wallawalla.edu> >>>> Reply-To: "Enhanced Machine Controller (EMC)" >>>> <emc-users@lists.sourceforge.net> >>>> To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> >>>> Subject: Re: [Emc-users] Rpi 3b+ to 7i90hd >>>> >>>> Not having Xilinx Impact tool on the Rpi (or anywhere >>>> at the moment), I found a tutorial on setting up >>>> OpenOCD for jtag on the Rpi. I have installed OpenOCD >>>> on my RPi 3B+ and connected the gpio to the JTAG pins >>>> on the 7i90HD, following this tutorial: >>>> >>>> https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fmovr0.com%2F2016%2F09%2F02%2Fuse-raspberry-pi-23-as-a-jtagswd-adapter%2F&data=04%7C01%7Cralph.stirling%40wallawalla.edu%7C02f90e1ea684499808de08d8b77e8b07%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C637461101424070565%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=0bYLhiJxHt0Yzp6vSUgW0BWalJIiU8LgXgRWfVj1tCI%3D&reserved=0 >>>> >>>> The last step seems to be to make a configuration >>>> file for the target device. The EEPROMs are WInbond >>>> 25Q16JVNIQ as best I can read the chip labels. OpenOCD >>>> doesn't have anything that looks directly applicable. >>>> I also don't know where the two chips are in the jtag >>>> chain. >>> >>> You dont need to do this if you can program the FPGA >>> (and JTAG programming large EEPROMS is glacially slow) >>> >>> If you can program the FPGA via JTAG, you program the FPGA with a SPI >>> configuration, and then run mesaflash from the RPI to write the >>> flash memory >>> >>> >>>> >>>> Am I heading down a rat hole, or getting close to success? >>>> >>>> Thanks again. >>>> -- Ralph >>>> ________________________________________ >>>> From: Peter C. Wallace [p...@mesanet.com] >>>> Sent: Thursday, January 7, 2021 3:47 PM >>>> To: Enhanced Machine Controller (EMC) >>>> Subject: Re: [Emc-users] Rpi 3b+ to 7i90hd >>>> >>>> CAUTION: This email originated from outside the Walla Walla University >>>> email system. >>>> >>>> >>>> On Thu, 7 Jan 2021, Ralph Stirling wrote: >>>> >>>>> Date: Thu, 7 Jan 2021 23:37:03 +0000 >>>>> From: Ralph Stirling <ralph.stirl...@wallawalla.edu> >>>>> Reply-To: "Enhanced Machine Controller (EMC)" >>>>> <emc-users@lists.sourceforge.net> >>>>> To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> >>>>> Subject: Re: [Emc-users] Rpi 3b+ to 7i90hd >>>>> >>>>> I assumed that the 7i90hd would recognize SPI >>>>> directly, like the 7c81 does. Do I have to go >>>>> dig up a parallel port computer from somewhere >>>>> and get at least mesaflash running on it just >>>>> so I can get spi working for the pi? That is an >>>>> unfortunate hurdle. I don't see anything in the >>>>> manual about needing to load the correct bitstream >>>>> over parallel in order to use spi. In fact, I read >>>>> this in the manual: >>>> >>>> Yep, you need to have SPI firmware loaded in the 7I90HD >>>> default 7I90HD firmware is EPP, so a device with a EPP >>>> interface is needed to load the SPI configuration >>>> I would suggest loading the SPI interface into the >>>> secondary flash leaving the primary as EPP for a fallback >>>> >>>> That is, power the 7I90 with the flash jumper in the "P" position >>>> them move the jumper to "S" before loadin the SPI firmware >>>> >>>> >>>>> >>>>> "Linux and Windows utility programs mesaflash and mesaflash.exe are >>>>> provided to >>>>> write configuration files to the 7I90HD EEPROM via the RS-422 interface >>>>> and LBP16. The >>>>> linux utility can also write configuration files via the EPP interface. >>>>> These files depend on >>>>> a simple SPI interface built into both the standard user FPGA bitfiles >>>>> and the fallback >>>>> bitfile." >>>> >>>> >>>> Well there are 2 SPI interfaces, the HM2 compatible host interface (which >>>> needs >>>> specific SPI firmware) and the SPI Flash memory interface (which is in HM2 >>>> memory space and allows access to the SPI flash chip) >>>> >>>>> >>>>> I can tack on a pullup to SDO. I have put four >>>>> scope probes on the four signals, and see data >>>>> when interrogating the 7c81, but not the 7i90hd. >>>>> The clock from the pi is correct. >>>>> >>>>> Thanks again. >>>>> -- Ralph >>>>> ________________________________________ >>>>> From: Peter C. Wallace [p...@mesanet.com] >>>>> Sent: Thursday, January 7, 2021 3:18 PM >>>>> To: Enhanced Machine Controller (EMC) >>>>> Subject: Re: [Emc-users] Rpi 3b+ to 7i90hd >>>>> >>>>> >>>>> Looks right >>>>> >>>>> 2 layer should be fine as long as the ground is solid (wide) >>>>> between the 7I90 and the RPI (and lo longer than a couple of >>>>> inches >>>>> >>>>> You might try adding a pullup to SDO (7I90 15) to see if you read >>>>> 0xFFFFFFFF which would indicate the the 7I90 is not driving SDO >>>>> >>>>> Sure you have a SPI config in the 7I90? >>>>> >>>>> >>>>> Peter Wallace >>>>> Mesa Electronics >>>>> >>>>> (\__/) >>>>> (='.'=) This is Bunny. Copy and paste bunny into your >>>>> (")_(") signature to help him gain world domination. >>>>> >>>>> >>>>> >>>>> _______________________________________________ >>>>> Emc-users mailing list >>>>> Emc-users@lists.sourceforge.net >>>>> https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=04%7C01%7Cralph.stirling%40wallawalla.edu%7C02f90e1ea684499808de08d8b77e8b07%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C637461101424070565%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=KXndzVR4YimkD5%2BjUj2BsIR%2FXndPInMZ7c26oT%2BA4yw%3D&reserved=0 >>>>> >>>>> >>>>> _______________________________________________ >>>>> Emc-users mailing list >>>>> Emc-users@lists.sourceforge.net >>>>> https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=04%7C01%7Cralph.stirling%40wallawalla.edu%7C02f90e1ea684499808de08d8b77e8b07%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C637461101424070565%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=KXndzVR4YimkD5%2BjUj2BsIR%2FXndPInMZ7c26oT%2BA4yw%3D&reserved=0 >>>>> >>>> >>>> Peter Wallace >>>> Mesa Electronics >>>> >>>> (\__/) >>>> (='.'=) This is Bunny. Copy and paste bunny into your >>>> (")_(") signature to help him gain world domination. >>>> >>>> >>>> >>>> _______________________________________________ >>>> Emc-users mailing list >>>> Emc-users@lists.sourceforge.net >>>> https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=04%7C01%7Cralph.stirling%40wallawalla.edu%7C02f90e1ea684499808de08d8b77e8b07%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C637461101424070565%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=KXndzVR4YimkD5%2BjUj2BsIR%2FXndPInMZ7c26oT%2BA4yw%3D&reserved=0 >>>> >>>> >>>> _______________________________________________ >>>> Emc-users mailing list >>>> Emc-users@lists.sourceforge.net >>>> https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=04%7C01%7Cralph.stirling%40wallawalla.edu%7C02f90e1ea684499808de08d8b77e8b07%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C637461101424070565%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=KXndzVR4YimkD5%2BjUj2BsIR%2FXndPInMZ7c26oT%2BA4yw%3D&reserved=0 >>>> >>> >>> Peter Wallace >>> Mesa Electronics >>> >>> (\__/) >>> (='.'=) This is Bunny. Copy and paste bunny into your >>> (")_(") signature to help him gain world domination. >>> >>> >>> >>> _______________________________________________ >>> Emc-users mailing list >>> Emc-users@lists.sourceforge.net >>> https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=04%7C01%7Cralph.stirling%40wallawalla.edu%7C02f90e1ea684499808de08d8b77e8b07%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C637461101424070565%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=KXndzVR4YimkD5%2BjUj2BsIR%2FXndPInMZ7c26oT%2BA4yw%3D&reserved=0 >>> >>> >>> _______________________________________________ >>> Emc-users mailing list >>> Emc-users@lists.sourceforge.net >>> https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=04%7C01%7Cralph.stirling%40wallawalla.edu%7C02f90e1ea684499808de08d8b77e8b07%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C637461101424080558%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=a6a7Lo1RzWZNzV1NRcEzDdktzwOxsmqnnYwFgfm%2FL18%3D&reserved=0 >>> >> >> Peter Wallace >> Mesa Electronics >> >> (\__/) >> (='.'=) This is Bunny. Copy and paste bunny into your >> (")_(") signature to help him gain world domination. >> >> >> >> _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=04%7C01%7Cralph.stirling%40wallawalla.edu%7C02f90e1ea684499808de08d8b77e8b07%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C637461101424080558%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=a6a7Lo1RzWZNzV1NRcEzDdktzwOxsmqnnYwFgfm%2FL18%3D&reserved=0 >> >> >> _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=04%7C01%7Cralph.stirling%40wallawalla.edu%7C02f90e1ea684499808de08d8b77e8b07%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C637461101424080558%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=a6a7Lo1RzWZNzV1NRcEzDdktzwOxsmqnnYwFgfm%2FL18%3D&reserved=0 >> > > Peter Wallace > Mesa Electronics > > (\__/) > (='.'=) This is Bunny. Copy and paste bunny into your > (")_(") signature to help him gain world domination. > > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=04%7C01%7Cralph.stirling%40wallawalla.edu%7C02f90e1ea684499808de08d8b77e8b07%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C637461101424080558%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=a6a7Lo1RzWZNzV1NRcEzDdktzwOxsmqnnYwFgfm%2FL18%3D&reserved=0 > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=04%7C01%7Cralph.stirling%40wallawalla.edu%7C02f90e1ea684499808de08d8b77e8b07%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C637461101424080558%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=a6a7Lo1RzWZNzV1NRcEzDdktzwOxsmqnnYwFgfm%2FL18%3D&reserved=0 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=04%7C01%7Cralph.stirling%40wallawalla.edu%7C02f90e1ea684499808de08d8b77e8b07%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C637461101424080558%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=a6a7Lo1RzWZNzV1NRcEzDdktzwOxsmqnnYwFgfm%2FL18%3D&reserved=0 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
