Multi-platform, and secure-only ARM errata workarounds
From: arnd@arndb.de (Arnd Bergmann)
Date: 2013-02-26 10:48:06
Also in:
linux-tegra
On Tuesday 26 February 2013, Catalin Marinas wrote:
On Tue, Feb 26, 2013 at 10:31:14AM +0000, Catalin Marinas wrote:quoted
On Tue, Feb 26, 2013 at 10:23:26AM +0000, Arnd Bergmann wrote:quoted
On Monday 25 February 2013, Stephen Warren wrote:quoted
Is there any other alternative I'm not seeing? Having the kernel suddenly become incompatible with any currently extant bootloader when I enable CONFIG_MULTIPLATFORM doesn't seem like a great idea.Could we make those errata be run-time enabled only when not booting in secure mode?There is no easy way to detect whether Linux booted in secure mode, unless we add some information in the DT. But I wouldn't add S vs NS information, rather which errata need to be enabled by the kernel.Another difficulty - parsing the DT is done later while some workarounds are enabled before the MMU (or require the MMU to be disabled temporarily).
Can we do it easily after detecting the machine_desc? Maybe we could add a bit mask of errata to the struct. Arnd