Date: Tue, 07 Oct 2014 21:31:42 +0900 From: Jaemin Yoo <zaemin.yoo@gmail.com> To: freebsd-arm@freebsd.org Subject: Re: Q: linking method for armv8 kernel build Message-ID: <5433DD2E.1050807@gmail.com> In-Reply-To: <20141006154314.1b909772@bender.lan> References: <5432A1B5.30406@gmail.com> <20141006154314.1b909772@bender.lan>
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2014-10-06 PM 11:43, Andrew Turner wrote: > On Mon, 06 Oct 2014 23:05:41 +0900 > Jaemin Yoo <zaemin.yoo@gmail.com> wrote: > >> Hello, I just began to download and build kernel for armv8 according >> to the following howto page. (https://wiki.freebsd.org/arm64) >> >> I could create the kernel image without problem. But 'file' says >> it's dynamically linked. I expected statically linked image to load >> it on dram using uboot. >> >> Is it meant to be? or am I missing some configuration? > > All examples of the FreeBSD kernel I've looked at say they are > dynamically linked. The requirement is the kernel needs to be loaded at > a 2MiB aligned address for the VA->PA translation to work. It will > create the page table so the kernel base points to the load address. > > You may have problems loading it with U-Boot. It expects to be loaded > by the loader as it passes in the device tree. U-Boot has been found to > be difficult to support on 32-bit arm. Is there a reason to prefer it > over UEFI? > > Andrew > Thanks. I'm doing most work at linux and vmlinux is mostly(?) statically linked. So I thought same goes for freebsd too. There are some 'UND' functions in kernel but I guess it's okay if they are not used. I got a 64bit arm board which runs linux from APM. It came with binary and source codes of u-boot. So I planned to enable bootelf and load kernel on dram after adding uart driver for the board. I just want to see freebsd kernel boot on arm64 with minimal changes. Best Regards, Jaemin ps. I hope to contribute for enabling freebsd on arm64. :)
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