Hi all, Here's one more patch for booting CPU_V6 and CPU_V7 omaps with the same kernel binary. This is needed to boot to user space, earlier I was just checking for "Mounted root". Now I'm wondering if some of these should be done as default y if CPU_V7 && !CPU_32v6K or default y if CPU_V7 && !CPU_V6 instead to make them more generic? This is, after the earlier patch selecting CPU_32v6K if !ARCH_OMAP2. Regards, Tony From: Tony Lindgren <tony@xxxxxxxxxxx> Date: Thu, 18 Feb 2010 13:22:58 -0800 Subject: [PATCH] arm: Allow mounting root on omaps with CPU_V6 and CPU_V7 To mount root, we need to disable VFPv3, HAS_TLS_REG, and set ARM_L1_CACHE_SHIFT=5. Otherwise we'll get something like this for CPUv3: Freeing init memory: 184K Internal error: Oops - undefined instruction: 0 [#1] last sysfs file: Modules linked in: CPU: 0 Not tainted (2.6.33-rc8-07824-gf2e1d91-dirty #36) PC is at no_old_VFP_process+0x8/0x3c LR is at __und_usr_unknown+0x0/0x14 ... Or the system just hangs if HAS_TLS_REG is set. The ARM_L1_CACHE_SHIFT most likely will cause issues too if not set to 5. Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 554cb9c..89dba0b 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1498,7 +1498,7 @@ config VFP config VFPv3 bool depends on VFP - default y if CPU_V7 + default y if CPU_V7 && !ARCH_OMAP2 config NEON bool "Advanced SIMD (NEON) Extension support" diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig index 4c2e90d..800f0ce 100644 --- a/arch/arm/mm/Kconfig +++ b/arch/arm/mm/Kconfig @@ -718,7 +718,7 @@ config TLS_REG_EMUL config HAS_TLS_REG bool depends on !TLS_REG_EMUL - default y if SMP || CPU_32v7 + default y if (SMP || CPU_32v7) && !ARCH_OMAP2 help This selects support for the CP15 thread register. It is defined to be available on some ARMv6 processors (including @@ -779,5 +779,5 @@ config CACHE_XSC3L2 config ARM_L1_CACHE_SHIFT int - default 6 if ARCH_OMAP3 || ARCH_S5PC1XX + default 6 if (ARCH_OMAP3 || ARCH_S5PC1XX) && !ARCH_OMAP2 default 5 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
