Teensy ISP on Synology mainboard

[Guillaume Maugein]

Hey,

First of all, thank you for the great work.

I am trying to access the Micron N25Q064A13 flash chip on my Synology NAS
DS413j.

I happen to have a teensy board available at hand, so I programmed it with
serprog software, using the instructions to which the flashrom website
points to.
I am under Xubuntu 15.04, and I installed flashrom from the daily builds
ppa.
If I remember, the version was 20150705~ubuntu14.04.1.
> xubuntu@xubuntu:~$ flashrom -R
> flashrom v0.9.8-unknown on Linux 3.19.0-25-generic (x86_64)

I connected the programmer with GND, MISO, MOSI, CLK and CS using grips. As
I am ISP, I did not connect the VCC.

I double-checked my connections, and they seem to be fine.

I start the NAS, and using serial terminal (on a different computer), I
stop the boot sequence at uboot prompt.
If I flinfo in the uboot, I get  the following info :

Marvell>> flinfo
> Bank#1:
> Flash Base Address  : 0xf8000000
> Flash Model         : ST N25Q064
> Manufacturer ID     : 0x20
> Device Id           : 0xba17
> Sector Size         : 64K
> Number of sectors   : 128
> Page Size           : 256
> Write Protection    : All

While the system is waiting on the prompt, I launch a flashrom command, and
the chip is not recognized :
> xubuntu@xubuntu:~$ sudo flashrom -V -p serprog:dev=/dev/ttyACM0:2000000
> flashrom v0.9.8-unknown on Linux 3.19.0-25-generic (x86_64)
> flashrom is free software, get the source code at http://www.flashrom.org
>
> flashrom was built with libpci 3.2.1, GCC 4.8.4, little endian
> Command line (3 args): flashrom -V -p serprog:dev=/dev/ttyACM0:2000000
> Calibrating delay loop... OS timer resolution is 1 usecs, 1104M loops per
> second, 10 myus = 10 us, 100 myus = 100 us, 1000 myus = 999 us, 10000 myus
> = 9998 us, 4 myus = 4 us, OK.
> Initializing serprog programmer
> Baud rate is 2000000 now.
> serprog: connected - attempting to synchronize
> .
> serprog: Synchronized
> serprog: Interface version ok.
> serprog: Bus support: parallel=off, LPC=off, FWH=off, SPI=on
> serprog: Maximum write-n length is 2037
> serprog: Maximum read-n length is 400384
> serprog: Programmer name is "Teensy LPC+SPI"
> serprog: Serial buffer size is 2044
> serprog: operation buffer size is 2048
> serprog: Output drivers enabled
> The following protocols are supported: SPI.
> Probing for {... the list is long ...}

Probing for Micron/Numonyx/ST N25Q064..1E, 8192 kB: RDID byte 0 parity
> violation. probe_spi_rdid_generic: id1 0x00, id2 0x00
> Probing for Micron/Numonyx/ST N25Q064..3E, 8192 kB: RDID byte 0 parity
> violation. probe_spi_rdid_generic: id1 0x00, id2 0x00
> Probing for {... the list continues ...}
> No EEPROM/flash device found.
> Note: flashrom can never write if the flash chip isn't found automatically.
> serprog: Output drivers disabled

Do you guys have any idea of what could I try next ? I'm stuck there...

Thanks for any help you could provide.

G.