Date: Tue, 10 Apr 2007 19:14:23 -0700 From: Peter Grehan <grehan@freebsd.org> To: vinay hegde <thisismevinay@yahoo.co.in> Cc: freebsd-ppc@freebsd.org Subject: Re: Help regarding the second stage loader Message-ID: <461C447F.8070504@freebsd.org> In-Reply-To: <221900.43273.qm@web8413.mail.in.yahoo.com>
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Hi Vinay, > Ok, so if I understand it correctly, the > code under sys/boot/powerpc need not always execute.. > is that right? What I mean is, suppose if we chose to > boot with, say yaboot, then is it absolutely necessary > to execute this second level loader as well _OR_ is > this only required if we need some different type of > image than what yaboot provides (for ex, in Linux- > u-boot provides uImage, so if we need some other type > of linux image, say zImage, then only this second > loader is required). So, is the concept same here? I think that's right. If yaboot could load the FreeBSD ELF kernel at the correct address, and even better if it could drop down metadata in the same format as the FreeBSD loader, then no second-stage loader would be required. However, if not, then yaboot could be used to load the FreeBSD second-stage loader, which would then load the kernel. There may still be issues with this since the FreeBSD loader uses OpenFirmware for i/o and memory allocation, and needs to be loaded at the correct address. > Also, is the code compiled by sys/boot/powerpc > directory part of the final FreeBSD PPC kernel image? No, it's the standalone loader - the kernel is separate. later, Peter.help
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