Hello,
I'm trying to write to a SST25VF080B SPI Serial Flash device from a Raspberry Pi 4. I've got the chip wired to SPI0 with a breadboard, and I've tried using both SPI0_CE0_N and SPI0_CE1_N. The WP# and HOLD# lines are tied high.
In trying to get this to work, I've tried two different approaches, and both approaches resulted in the same outcome: I can identify/read the device (all 0xFFs) but I cannot seem to write to the device. I'm reaching out here to see if anyone has any ideas why Approach 2 (using flashrom) doesn't work. It identifies the device but can't seem to write.
Approach 1 (MTD device) ------------
My first approach was to enable jedec-spi-nor in the device overlay tree in /boot/config.txt as shown below.
# Enable SST25VF080B dtoverlay=jedec-spi-nor,flash-spi0-1
Using this approach, I'm able to see /dev/mtd0 show up and /proc/mtd looks like this:
pi@raspberrypi:~ $ cat /proc/mtd dev: size erasesize name mtd0: 00100000 00001000 "spi0.1"
I can read/erase/write the device without any errors but write operations don't seem to be written to the device. See the session below.
pi@raspberrypi:~/workspace/overlays/flash $ sudo mtd_debug erase /dev/mtd0 0 4096 Erased 4096 bytes from address 0x00000000 in flash pi@raspberrypi:~/workspace/overlays/flash $ sudo mtd_debug read /dev/mtd0 0 4096 read.bin Copied 4096 bytes from address 0x00000000 in flash to read.bin pi@raspberrypi:~/workspace/overlays/flash $ xxd read.bin | head 00000000: ffff ffff ffff ffff ffff ffff ffff ffff ................ 00000010: ffff ffff ffff ffff ffff ffff ffff ffff ................ 00000020: ffff ffff ffff ffff ffff ffff ffff ffff ................ 00000030: ffff ffff ffff ffff ffff ffff ffff ffff ................ 00000040: ffff ffff ffff ffff ffff ffff ffff ffff ................ 00000050: ffff ffff ffff ffff ffff ffff ffff ffff ................ 00000060: ffff ffff ffff ffff ffff ffff ffff ffff ................ 00000070: ffff ffff ffff ffff ffff ffff ffff ffff ................ 00000080: ffff ffff ffff ffff ffff ffff ffff ffff ................ 00000090: ffff ffff ffff ffff ffff ffff ffff ffff ................ pi@raspberrypi:~/workspace/overlays/flash $ dd if=/dev/zero of=write.bin bs=4096 count=1 1+0 records in 1+0 records out 4096 bytes (4.1 kB, 4.0 KiB) copied, 0.000903078 s, 4.5 MB/s pi@raspberrypi:~/workspace/overlays/flash $ sudo mtd_debug write /dev/mtd0 0 4096 write.bin Copied 4096 bytes from write.bin to address 0x00000000 in flash pi@raspberrypi:~/workspace/overlays/flash $ sudo mtd_debug read /dev/mtd0 0 4096 read.bin Copied 4096 bytes from address 0x00000000 in flash to read.bin pi@raspberrypi:~/workspace/overlays/flash $ xxd read.bin | head 00000000: ffff ffff ffff ffff ffff ffff ffff ffff ................ 00000010: ffff ffff ffff ffff ffff ffff ffff ffff ................ 00000020: ffff ffff ffff ffff ffff ffff ffff ffff ................ 00000030: ffff ffff ffff ffff ffff ffff ffff ffff ................ 00000040: ffff ffff ffff ffff ffff ffff ffff ffff ................ 00000050: ffff ffff ffff ffff ffff ffff ffff ffff ................ 00000060: ffff ffff ffff ffff ffff ffff ffff ffff ................ 00000070: ffff ffff ffff ffff ffff ffff ffff ffff ................ 00000080: ffff ffff ffff ffff ffff ffff ffff ffff ................ 00000090: ffff ffff ffff ffff ffff ffff ffff ffff ................
Approach 2 (flashrom) ------------
In addition to using the jedec-spi-nor driver as shown above, I also tried using flashrom directly with /dev/spidev0.1. I changed my overlay tree to be as follows:
# Enable SST25VF080B # comment this out for now... dtoverlay=jedec-spi-nor,flash-spi0-1
# Enable /dev/spidev0.1 dtoverlay=spi0-cs
Then I try to use flashroom to write to the device, but I have the same problem with not being able to write to the device.
pi@raspberrypi:~ $ flashrom -VV -p linux_spi:dev=/dev/spidev0.1,spispeed=60000 -w image.bin flashrom on Linux 4.19.81-v7l+ (armv7l) flashrom is free software, get the source code at https://flashrom.org
flashrom was built with libpci 3.5.2, GCC 8.2.0, little endian Command line (5 args): flashrom -VV -p linux_spi:dev=/dev/spidev0.1,spispeed=60000 -w image.bin Using clock_gettime for delay loops (clk_id: 1, resolution: 1ns). Initializing linux_spi programmer Using device /dev/spidev0.1 Using 60000 kHz clock The following protocols are supported: SPI. Probing for AMIC A25L05PT, 64 kB: probe_spi_rdid_generic: id1 0xbf, id2 0x258e Probing for AMIC A25L05PU, 64 kB: probe_spi_rdid_generic: id1 0xbf, id2 0x258e Probing for AMIC A25L10PT, 128 kB: probe_spi_rdid_generic: id1 0xbf, id2 0x258e Probing for AMIC A25L10PU, 128 kB: probe_spi_rdid_generic: id1 0xbf, id2 0x258e Probing for AMIC A25L20PT, 256 kB: probe_spi_rdid_generic: id1 0xbf, id2 0x258e Probing for AMIC A25L20PU, 256 kB: probe_spi_rdid_generic: id1 0xbf, id2 0x258e Probing for AMIC A25L40PT, 512 kB: probe_spi_rdid_generic: id1 0xbf, id2 0x258e Probing for AMIC A25L40PU, 512 kB: probe_spi_rdid_generic: id1 0xbf, id2 0x258e Probing for AMIC A25L80P, 1024 kB: probe_spi_rdid_generic: id1 0xbf, id2 0x258e ... Probing for SST unknown SST SPI chip, 0 kB: probe_spi_rdid_generic: id1 0xbf, id2 0x258e Probing for ST unknown ST SPI chip, 0 kB: probe_spi_rdid_generic: id1 0xbf, id2 0x258e Probing for Sanyo unknown Sanyo SPI chip, 0 kB: probe_spi_rdid_generic: id1 0xbf, id2 0x258e Probing for Winbond unknown Winbond (ex Nexcom) SPI chip, 0 kB: probe_spi_rdid_generic: id1 0xbf, id2 0x258e Probing for Generic unknown SPI chip (RDID), 0 kB: probe_spi_rdid_generic: id1 0xbf, id2 0x258e Probing for Generic unknown SPI chip (REMS), 0 kB: probe_spi_rems: id1 0xbf, id2 0x8e Found SST flash chip "SST25VF080B" (1024 kB, SPI). Some block protection in effect, disabling... disabled. Reading old flash chip contents... done. Erasing and writing flash chip... Trying erase function 0... 0x000000-0x000fff:EW, 0x001000-0x001fff:S, 0x002000-0x002fff:S, 0x003000-0x003fff:S, 0x004000-0x004fff:S, 0x005000-0x005fff:S, 0x006000-0x006fff:S, 0x007000-0x007fff:S, 0x008000-0x008fff:S, 0x009000-0x009fff:S, 0x00a000-0x00afff:S, 0x00b000-0x00bfff:S, 0x00c000-0x00cfff:S, 0x00d000-0x00dfff:S, 0x00e000-0x00efff:S, 0x00f000-0x00ffff:S, 0x010000-0x010fff:S, 0x011000-0x011fff:S, 0x012000-0x012fff:S, 0x013000-0x013fff:S, 0x014000-0x014fff:S, 0x015000-0x015fff:S, 0x016000-0x016fff:S, 0x017000-0x017fff:S, 0x018000-0x018fff:S, 0x019000-0x019fff:S, 0x01a000-0x01afff:S, 0x01b000-0x01bfff:S, 0x01c000-0x01cfff:S, 0x01d000-0x01dfff:S, 0x01e000-0x01efff:S, 0x01f000-0x01ffff:S, 0x020000-0x020fff:S, 0x021000-0x021fff:S, 0x022000-0x022fff:S, 0x023000-0x023fff:S, 0x024000-0x024fff:S, 0x025000-0x025fff:S, 0x026000-0x026fff:S, 0x027000-0x027fff:S, 0x028000-0x028fff:S, 0x029000-0x029fff:S, 0x02a000-0x02afff:S, 0x02b000-0x02bfff:S, 0x02c000-0x02cfff:S, 0x02d000-0x02dfff:S, 0x02e000-0x02efff:S, 0x02f000-0x02ffff:S, 0x030000-0x030fff:S, 0x031000-0x031fff:S, 0x032000-0x032fff:S, 0x033000-0x033fff:S, 0x034000-0x034fff:S, 0x035000-0x035fff:S, 0x036000-0x036fff:S, 0x037000-0x037fff:S, 0x038000-0x038fff:S, 0x039000-0x039fff:S, 0x03a000-0x03afff:S, 0x03b000-0x03bfff:S, 0x03c000-0x03cfff:S, 0x03d000-0x03dfff:S, 0x03e000-0x03efff:S, 0x03f000-0x03ffff:S, 0x040000-0x040fff:S, 0x041000-0x041fff:S, 0x042000-0x042fff:S, 0x043000-0x043fff:S, 0x044000-0x044fff:S, 0x045000-0x045fff:S, 0x046000-0x046fff:S, 0x047000-0x047fff:S, 0x048000-0x048fff:S, 0x049000-0x049fff:S, 0x04a000-0x04afff:S, 0x04b000-0x04bfff:S, 0x04c000-0x04cfff:S, 0x04d000-0x04dfff:S, 0x04e000-0x04efff:S, 0x04f000-0x04ffff:S, 0x050000-0x050fff:S, 0x051000-0x051fff:S, 0x052000-0x052fff:S, 0x053000-0x053fff:S, 0x054000-0x054fff:S, 0x055000-0x055fff:S, 0x056000-0x056fff:S, 0x057000-0x057fff:S, 0x058000-0x058fff:S, 0x059000-0x059fff:S, 0x05a000-0x05afff:S, 0x05b000-0x05bfff:S, 0x05c000-0x05cfff:S, 0x05d000-0x05dfff:S, 0x05e000-0x05efff:S, 0x05f000-0x05ffff:S, 0x060000-0x060fff:S, 0x061000-0x061fff:S, 0x062000-0x062fff:S, 0x063000-0x063fff:S, 0x064000-0x064fff:S, 0x065000-0x065fff:S, 0x066000-0x066fff:S, 0x067000-0x067fff:S, 0x068000-0x068fff:S, 0x069000-0x069fff:S, 0x06a000-0x06afff:S, 0x06b000-0x06bfff:S, 0x06c000-0x06cfff:S, 0x06d000-0x06dfff:S, 0x06e000-0x06efff:S, 0x06f000-0x06ffff:S, 0x070000-0x070fff:S, 0x071000-0x071fff:S, 0x072000-0x072fff:S, 0x073000-0x073fff:S, 0x074000-0x074fff:S, 0x075000-0x075fff:S, 0x076000-0x076fff:S, 0x077000-0x077fff:S, 0x078000-0x078fff:S, 0x079000-0x079fff:S, 0x07a000-0x07afff:S, 0x07b000-0x07bfff:S, 0x07c000-0x07cfff:S, 0x07d000-0x07dfff:S, 0x07e000-0x07efff:S, 0x07f000-0x07ffff:S, 0x080000-0x080fff:S, 0x081000-0x081fff:S, 0x082000-0x082fff:S, 0x083000-0x083fff:S, 0x084000-0x084fff:S, 0x085000-0x085fff:S, 0x086000-0x086fff:S, 0x087000-0x087fff:S, 0x088000-0x088fff:S, 0x089000-0x089fff:S, 0x08a000-0x08afff:S, 0x08b000-0x08bfff:S, 0x08c000-0x08cfff:S, 0x08d000-0x08dfff:S, 0x08e000-0x08efff:S, 0x08f000-0x08ffff:S, 0x090000-0x090fff:S, 0x091000-0x091fff:S, 0x092000-0x092fff:S, 0x093000-0x093fff:S, 0x094000-0x094fff:S, 0x095000-0x095fff:S, 0x096000-0x096fff:S, 0x097000-0x097fff:S, 0x098000-0x098fff:S, 0x099000-0x099fff:S, 0x09a000-0x09afff:S, 0x09b000-0x09bfff:S, 0x09c000-0x09cfff:S, 0x09d000-0x09dfff:S, 0x09e000-0x09efff:S, 0x09f000-0x09ffff:S, 0x0a0000-0x0a0fff:S, 0x0a1000-0x0a1fff:S, 0x0a2000-0x0a2fff:S, 0x0a3000-0x0a3fff:S, 0x0a4000-0x0a4fff:S, 0x0a5000-0x0a5fff:S, 0x0a6000-0x0a6fff:S, 0x0a7000-0x0a7fff:S, 0x0a8000-0x0a8fff:S, 0x0a9000-0x0a9fff:S, 0x0aa000-0x0aafff:S, 0x0ab000-0x0abfff:S, 0x0ac000-0x0acfff:S, 0x0ad000-0x0adfff:S, 0x0ae000-0x0aefff:S, 0x0af000-0x0affff:S, 0x0b0000-0x0b0fff:S, 0x0b1000-0x0b1fff:S, 0x0b2000-0x0b2fff:S, 0x0b3000-0x0b3fff:S, 0x0b4000-0x0b4fff:S, 0x0b5000-0x0b5fff:S, 0x0b6000-0x0b6fff:S, 0x0b7000-0x0b7fff:S, 0x0b8000-0x0b8fff:S, 0x0b9000-0x0b9fff:S, 0x0ba000-0x0bafff:S, 0x0bb000-0x0bbfff:S, 0x0bc000-0x0bcfff:S, 0x0bd000-0x0bdfff:S, 0x0be000-0x0befff:S, 0x0bf000-0x0bffff:S, 0x0c0000-0x0c0fff:S, 0x0c1000-0x0c1fff:S, 0x0c2000-0x0c2fff:S, 0x0c3000-0x0c3fff:S, 0x0c4000-0x0c4fff:S, 0x0c5000-0x0c5fff:S, 0x0c6000-0x0c6fff:S, 0x0c7000-0x0c7fff:S, 0x0c8000-0x0c8fff:S, 0x0c9000-0x0c9fff:S, 0x0ca000-0x0cafff:S, 0x0cb000-0x0cbfff:S, 0x0cc000-0x0ccfff:S, 0x0cd000-0x0cdfff:S, 0x0ce000-0x0cefff:S, 0x0cf000-0x0cffff:S, 0x0d0000-0x0d0fff:S, 0x0d1000-0x0d1fff:S, 0x0d2000-0x0d2fff:S, 0x0d3000-0x0d3fff:S, 0x0d4000-0x0d4fff:S, 0x0d5000-0x0d5fff:S, 0x0d6000-0x0d6fff:S, 0x0d7000-0x0d7fff:S, 0x0d8000-0x0d8fff:S, 0x0d9000-0x0d9fff:S, 0x0da000-0x0dafff:S, 0x0db000-0x0dbfff:S, 0x0dc000-0x0dcfff:S, 0x0dd000-0x0ddfff:S, 0x0de000-0x0defff:S, 0x0df000-0x0dffff:S, 0x0e0000-0x0e0fff:S, 0x0e1000-0x0e1fff:S, 0x0e2000-0x0e2fff:S, 0x0e3000-0x0e3fff:S, 0x0e4000-0x0e4fff:S, 0x0e5000-0x0e5fff:S, 0x0e6000-0x0e6fff:S, 0x0e7000-0x0e7fff:S, 0x0e8000-0x0e8fff:S, 0x0e9000-0x0e9fff:S, 0x0ea000-0x0eafff:S, 0x0eb000-0x0ebfff:S, 0x0ec000-0x0ecfff:S, 0x0ed000-0x0edfff:S, 0x0ee000-0x0eefff:S, 0x0ef000-0x0effff:S, 0x0f0000-0x0f0fff:S, 0x0f1000-0x0f1fff:S, 0x0f2000-0x0f2fff:S, 0x0f3000-0x0f3fff:S, 0x0f4000-0x0f4fff:S, 0x0f5000-0x0f5fff:S, 0x0f6000-0x0f6fff:S, 0x0f7000-0x0f7fff:S, 0x0f8000-0x0f8fff:S, 0x0f9000-0x0f9fff:S, 0x0fa000-0x0fafff:S, 0x0fb000-0x0fbfff:S, 0x0fc000-0x0fcfff:S, 0x0fd000-0x0fdfff:S, 0x0fe000-0x0fefff:S, 0x0ff000-0x0fffff:S Erase/write done. Verifying flash... FAILED at 0x00000000! Expected=0x61, Found=0xff, failed byte count from 0x00000000-0x000fffff: 0x3 Your flash chip is in an unknown state. Please report this on IRC at chat.freenode.net (channel #flashrom) or mail flashrom@flashrom.org, thanks!
As you can see, it appears to identify the chip as "SST25VF080B", and it's able to read/erase/write. However, when it goes to verify the written values it fails.
Does anyone have any idea of things to try?
Thanks!
Anthony
did you try to reduce the spispeed frequency?
-
Anthony DeRosa -
evrinoma＠gmail.com