From mboxrd@z Thu Jan 1 00:00:00 1970 From: Albert ARIBAUD Date: Sat, 13 Nov 2010 09:20:35 +0100 Subject: [U-Boot] RFC: Aligning arch initialisation sequences In-Reply-To: <4CDE1107.80108@gmail.com> References: <4CD67A22.9040802@gmail.com> <201011091835.38581.vapier@gentoo.org> <4CDE1107.80108@gmail.com> Message-ID: <4CDE4A53.4070106@free.fr> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de Le 13/11/2010 05:16, Graeme Russ a ?crit : > I essence, the gd pointer is a unique global variable available prior to > relocation. On all other arches, this is achieved by using a reserved > register which I do not have the luxury of on x86 :( Dusting off ooooold knowledge of x86 and without even a glance at x86 u-boot... Since GD is the only global used pre-reloc, can you not ensure it always ends up first in the data segment, and then manage two values for the DS segment reg, one pre-reloc where only gd can be used, and one post-reloc where gd and all the other globals can be accessed? > Regards, > > Graeme Amicalement, -- Albert.