[coreboot] Is windows driver for EHCI DEBUG available.

[Chris Roberts]

I recently worked with Kyosti to update the EHCI Debug cable.

You can find an updated version of the cable here, under examples/debugdev_full_duplex.
https://github.com/night199uk/fx2lib <https://github.com/night199uk/fx2lib>
There is a .PDF with a build spec based on the newer version of the FX2LP boards that are easily available from taobao or eBay. It should work with the old ones too. It is a slightly modified version of Kyosti’s original (excellent) spec that got me started.

The new cable/firmware complies with the 8-byte packet requirement of the EHCI Debug Device specification to avoid overrunning the EHCI Debug port buffers. Also in theory it should be faster (perhaps if you remove the 8-byte packetization) due to the use of GPIF streaming.

The EHCI Debug cable implements the CDC ACM spec - I didn’t modify that part at all, but in theory it should appear as a standard serial port under Windows. I’ve tested it with Linux and OS X and both support it natively through CDC ACM drivers and I believe a friend of mine tested it working as such.

Also EDK2 supports it for SourceLevelDebugPkg. That needs some minor patches as EDK2 hard-codes the USB endpoint numbers for Ajays - I may contribute back patches to read those from the descriptor at some point but it’s an easy modification to make manually. 

Regards,
Chris.

> On 4 Apr 2016, at 13:00, Kyösti Mälkki <kyosti.malkki at gmail.com> wrote:
> 
> 
> ---------- Forwarded message ----------
> From: Zheng Bao <fishbaoz at hotmail.com <mailto:fishbaoz at hotmail.com>>
> Date: Fri, Mar 18, 2016 at 4:01 PM
> Subject: [coreboot] Is windows driver for EHCI DEBUG available.
> To: "coreboot at coreboot.org <mailto:coreboot at coreboot.org>" <coreboot at coreboot.org <mailto:coreboot at coreboot.org>>
> 
> 
> Hi, all,
> http://www.coreboot.org/DIY_EHCI_debug_dongle <https://www.coreboot.org/DIY_EHCI_debug_dongle>
> http://www.coreboot.org/EHCI_debug_dongle <https://www.coreboot.org/EHCI_debug_dongle>
> I want to build a EHCI debug dongle based on above links.
> I am wondering if the windows driver of the dongle is available.
> I google it but can not find it. I assume it is a generic driver.
> Who knows about that?
> 
> Thanks.
> 
> Zheng
> 
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