Too slow firmware download with ST-LINK v2 under Windows 7 x64

[leshich-k]

I have migrated from Windows 7 x86 to x64 and since then I noticed that the firmware download speed has reduced hardly. The download now goes at least 

twice or more slower than under Windows 7 x86. I use the latest driver for st-link dongle (v2.1.0.0). What could be the problem?

[TDK]

Check the SWD clock speed it's using. It's also possible you're not doing quite the same thing. Maybe in the second case you're verifying data as well as programming.

[leshich-k]

SWD clock is the same in both cases, verifying is turned off. Moreover, this is exectly the same MDK-ARM project.

I have also tried ULINK2 debugger - this works good either under x86/x64.

It looks like something is wrong with st-link v2 driver under Win7 x64.

[Pavel A.]

Is the 64-bit PC the same as 32-bit, or a different one?

Is your USB host controller USB3 (with a 3rd party driver) by chance?

-- pa

[leshich-k]

Actually the PC is the different one with USB3.0.

I also tried to plug st-link into USB2.0 port on the front panel, but the result was the same.

[Pavel A.]

TL;DR... It's time to upgrade to Windows 10 or Linux 🙂