4.6a USB driver bug

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The generic USB driver of 4.6a seems to be pretty stable on most systems except 
the ones with VIA chipset based motherboards - for example, MSI MS 7312. The 
driver seems to be pretty stable on Intel chipset boards.  

What steps will reproduce the problem?

1. add "usb --init" as the first line in menu or manually invoke the driver.

2. Driver will load successfully and loading floppy images seems to work. But 
it will fail to load any WinPE 3 or WinPE 4 based images. For example, "Windows 
7" or "Windows 8" setup ( chain loading Bootmgr ). Booting will hang at 
"Loading files" screen forever.    

3. PE will boot fine if the USB driver is not loaded ( although the loading 
speed will be slower ).

What version of the product are you using? On what operating system?

All versions of 4.6a seems to be affected.

Please provide any additional information below.

This issue is persistent with all VIA chipset boards. So far i tested multiple 
VIA chipset MoBos from MSI and BIOSTAR.

I attached "CPU-Z" log of MSI MS 7312 MoBo which contains details about BIOS 
and USB including hardware id information.

Original issue reported on code.google.com by anshaded...@gmail.com on 12 Dec 2014 at 2:10

Attachments:

• [MS 7312.txt](https://storage.googleapis.com/google-code-attachments/grub4dos-chenall/issue-208/comment-0/MS 7312.txt)

[GoogleCodeExporter]

Interestingly, the alternative USB driver of "Plop Boot Manager" also doesn't 
seems to work on these motherboards. Selecting USB boot option from "plop" will 
cause it to hang forever.    

Original comment by anshaded...@gmail.com on 12 Dec 2014 at 2:15