[flashrom] Re: request for support programmer with ch341b

[Anastasia Klimchuk]

It seems libusb dependency is not recognised, in your case you need libusb.
When you are building from source, in the beginning meson prints lots
of info, find what it says about libusb.
For example, on my environment here I have this line:

Run-time dependency libusb-1.0 found: YES 1.0.27

I suspect you have NO and you need to achieve YES
Check the instructions about libraries, especially section on Ubuntu:
https://flashrom.org/dev_guide/building_from_source.html

For your work to add support for CH341b it would be really good to
have a patch eventually.
Similar thing was implemented for ch347_spi recently, see how now it
knows about two devices IDs and tries each of them:
https://github.com/flashrom/flashrom/blob/main/ch347_spi.c#L60

On Mon, Dec 9, 2024 at 9:26 PM S.  wrote:
> Hello,
>
> I've never programmed in C languages before, but it seemed easy to me
> since the only difference between ch341a and ch341b is that ch341b no
> longer needs an external crystal
> https://www.wch-ic.com/downloads/file/16.html (Chapter 3., Note). I
> therefore changed the PID in line 90 of ch341a_spi.c from 5512 to 5523
> and added an entry for the ch341b in flashrom_udev.rules :
>
> # Winchiphead (WCH) CH341b based programmer
> ATTRS{idVendor}==“1a86”, ATTRS{idProduct}==“5523”, MODE=“664”,
> GROUP="plugdev”
>
> The result is that the flashrom call only shows a few programmers, I can
> no longer select the ch341:
>
> flashrom v1.5.0 on Linux 6.8.0-49-generic (x86_64)
> flashrom is free software, get the source code at https://flashrom.org
> Please select a programmer with the --programmer parameter.
> Valid choices are:
> dummy, serprog, buspirate_spi, rayer_spi, pony_spi, linux_mtd, linux_spi.
>
> flashrom 1.2 is delivered with Ubuntu, more programmers are offered:
>
> flashrom v1.2 on Linux 6.8.0-49-generic (x86_64)
> flashrom is free software, get the source code at https://flashrom.org
> Please select a programmer with the --programmer parameter.
> To choose the mainboard of this computer use 'internal'.
> Valid choices are:
> internal, dummy, nic3com, nicrealtek, gfxnvidia, drkaiser, satasii,
> atavia, it8212, ft2232_spi, serprog, buspirate_spi, dediprog,
> developerbox, rayer_spi, pony_spi, nicintel, nicintel_spi,
> nicintel_eeprom, ogp_spi, satamv, linux_mtd, linux_spi, usbblaster_spi,
> pickit2_spi, ch341a_spi, digilent_spi, stlinkv3_spi.
>
> Regards
> Stephan
>
> Am 09.12.24 um 01:11 schrieb Anastasia Klimchuk:
> > Hello Stephan,
> >
> > It's so good that you are trying to do things by yourself!
> >
> > I understand you have written some code locally, which you are now
> > trying to make work. Would you be comfortable to share this as a
> > patch? This way people can look and perhaps give advice.
> >
> > The instructions how to send a patch are here:
> > https://flashrom.org/dev_guide/development_guide.html
> >
> > You can add in the commit title "WIP", "doesn't work yet", or
> > something like this. And post the link to the patch in this thread.
> > Thank you!
> >
> > On Sun, Dec 8, 2024 at 12:14 AM S.  wrote:
> > > Next errormessage, now he likes the VID 5523:
> > >
> > > flashrom v1.5.0 on Linux 6.8.0-49-generic (x86_64)
> > > flashrom is free software, get the source code at https://flashrom.org
> > >
> > > Using default 2000kHz clock. Use 'spispeed' parameter to override.
> > > linux_spi_init: failed to set speed to 2000000Hz: Inappropriate ioctl
> > > for device
> > > Error: Programmer initialization failed.
> > >
> > > Stephan
> > >
> > > Am 07.12.24 um 13:58 schrieb S.:
> > > > Hello,
> > > > now I have tried it myself, the only difference I know between ch341a
> > > > and ch341b is PID:VID 1A86:5523 (instead of 1A86:5512). So I changed the
> > > > VID in ch341a_spi.c and flashrom_udev.rules. But unfortunately this does
> > > > not help, I get the error message “Couldn't open device 1a86:5512” when
> > > > starting flashrom, although in the source code PID:VID is now set to
> > > > 1a86:5523. Strange.
> > > > Stephan
> > > >
> > > > Am 25.10.24 um 15:36 schrieb S.:
> > > > > flashrom supports only programmers with ch341a, but many programmers
> > > > > sold now have ch341b onboard, pid:vid is then 1a86:5523
> > > > >
> > > > > tnx in advance
> > > > > Stephan
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