[PATCH 1/2] ARM: Add Kconfig option to use mkimage -T kernel_noload
From: Uwe Kleine-König <hidden>
Date: 2012-02-29 19:12:10
Also in:
linux-tegra
On Wed, Feb 29, 2012 at 10:33:58AM -0800, Tim Bird wrote:
On 02/29/2012 10:14 AM, Jean-Christophe PLAGNIOL-VILLARD wrote:quoted
On 08:58 Wed 29 Feb , Stephen Warren wrote:quoted
Jean-Christophe PLAGNIOL-VILLARD wrote at Wednesday, February 29, 2012 5:30 AM:quoted
On 17:03 Tue 28 Feb , Stephen Warren wrote:quoted
uImage files typically encode a single absolute load and entry address. This is inconvenient when attempting to share that uImage across multiple SoCs with different physical RAM addresses. Recent versions of mkimage implement a "kernel_noload" image type which encodes no absolute load address, and a relative entry address. This works well for uImage-wrapped ARM zImages, since they are relocatable. This is enabled by commit b9b50e89d317c58becd0e2d7fac2e21e3a81dd0a "image: Implement IH_TYPE_KERNEL_NOLOAD" in U-Boot. Signed-off-by: Stephen Warren <redacted> --- I assume I should put this into the ARM patch tracker if it's OK?Again a new option for uImage no why not just boot the zImage in this case the uImage is uselessU-Boot doesn't support zImage at present. A patch was posted to support it at least for ARM, but needed a little work before it could be committed.Sorry I see no advantage to have the uImage build by the kernel anymore as we have a relocatable zImage I'll even drop its supportThis seems at least premature, and possibly ill-advised in general. There are lots of U-Boot images out in the field, many of which that are rarely updated. A lot of workflow will be disrupted unnecessarily by a change like this. Could you wait to drop uImage build support in the kernel until U-Boot supports zImage, and has worked it's way into the field for a few years?
I admit I didn't check for a few years, but regarding that the values used to build the uImage from a zImage are (or at least were) quite bad, I'd say deprecate the uImage target today. Uwe -- Pengutronix e.K. | Uwe Kleine-K?nig | Industrial Linux Solutions | http://www.pengutronix.de/ |