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authorThomas Petazzoni <thomas.petazzoni@free-electrons.com>2014-02-18 17:02:54 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2014-02-21 11:56:32 +0000
commitb3634575930857724d5c3987a2739b0637999b4e (patch)
tree424a9c3e69f298758dddceffff76a3cc2410ac6d /arch/arm
parentc9698e5cd6ad1ff2844bc44fabddc0f2e0562047 (diff)
downloadlinux-b3634575930857724d5c3987a2739b0637999b4e.tar.gz
ARM: 7980/1: kernel: improve error message when LPAE config doesn't match CPU
Currently, when the kernel is configured with LPAE support, but the CPU doesn't support it, the error message is fairly cryptic: Error: unrecognized/unsupported processor variant (0x561f5811). This messages is normally shown when there is an issue when comparing the processor ID (CP15 0, c0, c0) with the values/masks described in proc-v7.S. However, the same message is displayed when LPAE support is enabled in the kernel configuration, but not available in the CPU, after looking at ID_MMFR0 (CP15 0, c0, c1, 4). Having the same error message is highly misleading. This commit improves this by showing a different error message when this situation occurs: Error: Kernel with LPAE support, but CPU does not support LPAE. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/kernel/head-common.S12
-rw-r--r--arch/arm/kernel/head.S2
2 files changed, 13 insertions, 1 deletions
diff --git a/arch/arm/kernel/head-common.S b/arch/arm/kernel/head-common.S
index 47cd974e57ea..c96ecacb2021 100644
--- a/arch/arm/kernel/head-common.S
+++ b/arch/arm/kernel/head-common.S
@@ -177,6 +177,18 @@ __lookup_processor_type_data:
.long __proc_info_end
.size __lookup_processor_type_data, . - __lookup_processor_type_data
+__error_lpae:
+#ifdef CONFIG_DEBUG_LL
+ adr r0, str_lpae
+ bl printascii
+ b __error
+str_lpae: .asciz "\nError: Kernel with LPAE support, but CPU does not support LPAE.\n"
+#else
+ b __error
+#endif
+ .align
+ENDPROC(__error_lpae)
+
__error_p:
#ifdef CONFIG_DEBUG_LL
adr r0, str_p1
diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S
index 914616e0bdcd..f5f381d91556 100644
--- a/arch/arm/kernel/head.S
+++ b/arch/arm/kernel/head.S
@@ -102,7 +102,7 @@ ENTRY(stext)
and r3, r3, #0xf @ extract VMSA support
cmp r3, #5 @ long-descriptor translation table format?
THUMB( it lo ) @ force fixup-able long branch encoding
- blo __error_p @ only classic page table format
+ blo __error_lpae @ only classic page table format
#endif
#ifndef CONFIG_XIP_KERNEL