Date: Wed, 03 Apr 2002 10:44:17 -0500 (EST) From: John Baldwin <jhb@FreeBSD.org> To: Poul-Henning Kamp <phk@critter.freebsd.dk> Cc: freebsd-hackers@FreeBSD.ORG, freebsd-questions@FreeBSD.ORG, "Kreider, Carl" <carl.kreider@windriver.com> Subject: Re: read a file from a driver Message-ID: <XFMail.20020403104417.jhb@FreeBSD.org> In-Reply-To: <40835.1017848294@critter.freebsd.dk>
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On 03-Apr-2002 Poul-Henning Kamp wrote: > In message <20020403101614.A12363@indy.doctordesign.com>, "Kreider, Carl" > write > s: >> >>I am working on an embedded project running FreeBSD, and my driver >>for our custom card needs to load an FPGA with code. I know I can >>compile the code in as data, but for ease of development, I would >>rather fetch the FPGA code from a file. With a driver in kernel >>space. Really. >> >>Can it be done? If so, how? open() and read() are obviously in libc >>which rules them out. Do I have to write my own in assembler? > > Don't even think about it. > > At the time your driver is probed/attached, there is no filesystems > mounted yet. > > Best suggestion is to use an ioctl to download the data from > userland. Or load the firmware using kldload or from the loader using a type string similar to the way we do MFS root filesystems. -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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