Date: Thu, 24 Jun 2010 17:58:42 +0200 From: Hans Petter Selasky <hselasky@c2i.net> To: freebsd-usb@freebsd.org Cc: Friedrich Schick <friedrich.schick@x2e.de> Subject: Re: Standalone version Message-ID: <201006241758.42608.hselasky@c2i.net> In-Reply-To: <81cb17da958b5d9242d0267c59e31d8a@groupware> References: <81cb17da958b5d9242d0267c59e31d8a@groupware>
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On Thursday 24 June 2010 14:24:01 Friedrich Schick wrote: > Hello, > > we have an embedded system running the eCos real-time operating system. Now > we consider porting the USB stack from FreeBSD to eCos. What needs to be > done to have a running standalone version of the FreeBSD USB stack? The > work may also be interesting to anybody, who runs an embedded system > without having a real operting system as FreeBSD or Linux. > Hi, On the high-level you need to wrap malloc, newbus, thread creation, timers, mutexes and condition variables. If you want DMA enabled devices to work like the EHCI, you also need a wrapper for busdma. This can be compile-time opted out. I have created a wrapper layer that allows you to compile the core of the FreeBSD 8.x USB stack in userspace. I could send you a link off-list if you are interested. Minimum footprint I've seen using the stock USB core is: 64-128Kbytes It is possible to feature reduce the USB stack and then the executable footprint will be reduced aswell. --HPS
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