On Tue, Jan 27, 2015 at 01:46:11PM +0100, Linus Walleij wrote:
While the Freescale ARMv8 board LS2085A will enter U-Boot both on a master and a secondary (slave) CPU, this is not the common behaviour on ARMv8 platforms. The norm is that U-Boot is entered from the master CPU only, while the other CPUs are kept in WFI (wait for interrupt) state.
The code determining which CPU we are running on is using the MPIDR register, but the definition of that register varies with platform to some extent, and handling multi-cluster platforms (such as the Juno) will become cumbersome. It is better to only enable the multiple entry code on machines that actually need it and disable it by default.
Make the single entry default and add a special CONFIG_ARMV8_MULTIENTRY config option to be used by the platforms that need multientry and set it for the LS2085A. Delete all use of the CPU_RELEASE_ADDR from the Vexpress64 boards as it is just totally unused and misleading, and make it conditional in the generic start.S code.
This makes the Juno platform start U-Boot properly.
Signed-off-by: Linus Walleij linus.walleij@linaro.org
This seems fine conceptually but can you add arch/arm/cpu/armv8/Kconfig to introduce the ARMV8_MULTIENTRY symbol and then just enable it for LS2085A there? Thanks!