From mboxrd@z Thu Jan 1 00:00:00 1970 From: James Hogan Subject: Re: [RFC PATCH v1 12/40] metag: Build infrastructure Date: Tue, 20 Nov 2012 15:06:30 +0000 Message-ID: <50AB9C76.1010107@imgtec.com> References: <1351700061-7203-1-git-send-email-james.hogan@imgtec.com> <1351700061-7203-13-git-send-email-james.hogan@imgtec.com> <201211091446.28068.arnd@arndb.de> Mime-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-15" Content-Transfer-Encoding: 7bit Return-path: Received: from multi.imgtec.com ([194.200.65.239]:56733 "EHLO multi.imgtec.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751595Ab2KTPHl (ORCPT ); Tue, 20 Nov 2012 10:07:41 -0500 In-Reply-To: <201211091446.28068.arnd@arndb.de> Sender: linux-arch-owner@vger.kernel.org List-ID: To: Arnd Bergmann Cc: linux-arch@vger.kernel.org On 09/11/12 14:46, Arnd Bergmann wrote: > On Wednesday 31 October 2012, James Hogan wrote: >> + >> +define archhelp >> + echo '* vmlinux.bin - Binary kernel image (arch/$(ARCH)/boot/vmlinux.bin)' >> + @echo ' uImage - Alias to bootable U-Boot image' >> + @echo ' uImage.bin - Kernel-only image for U-Boot (bin)' >> + @echo ' uImage.gz - Kernel-only image for U-Boot (gzip)' >> + @echo ' uImage.bz2 - Kernel-only image for U-Boot (bzip2)' >> + @echo ' uImage.lzma - Kernel-only image for U-Boot (lzma)' >> + @echo ' uImage.xz - Kernel-only image for U-Boot (xz)' >> + @echo ' uImage.lzo - Kernel-only image for U-Boot (lzo)' >> +endef > > The uImage format is causing some trouble on ARM because it requires knowing > the load address at boot time, so we try to move people towards using just > zImage files there. You might want to consider the same. Could you point me at some info about this problem? I'm not clear why needing to know the load address at boot is a problem, or how zImage helps. Does this presume that the bootloader starts the kernel with the MMU bypassed? > It's probably not necessary to have both lzma and xz formats since they > are the same algorithm with different headers afaik. This was copied from arch/sh/boot/Makefile if I remember right. Is either of them preferred? Thanks James