Re: USB Boot

[Peter Stuge]

On Tue, Jun 01, 2004 at 09:42:20PM -0700, YhLu wrote:
> OHCI usb boot ok now.

Agree with Eric, congratulations! :)
> But it is some slow, only 173KB/S,
>
> Full speed should be 12Mbps/8 = 1500KB/s

Actually not. 12Mbps is the speed on the USB wire and each of the
protocols in the stack and in the application causes some overhead,
as you know.

I don't know much specifically about USB storage but I'd guesstimate
the maximum possible throughput somewhere between 1000kb/s and
1400kb/s. The simplest optimization is to increase the block
transfer size to always try to transfer full 64kb, if that hasn't
been done already.

Great to have a complete USB boot solution anyway!

//Peter