path: root/arch
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authorGravatar Alexey Brodkin <Alexey.Brodkin@synopsys.com>2015-07-17 12:11:42 +0300
committerGravatar Thomas Petazzoni <thomas.petazzoni@free-electrons.com>2015-07-18 14:07:35 +0200
commit3720e28d1595ea0fea349009d7b0360914f32ef6 (patch)
tree7c4443ced649ef949507521ea0cdad3aef66084c /arch
parentdaa433bff6d2d9934705feacd3619a7618d13ae5 (diff)
ARC: allow selection of MMU page size
Modern ARC cores (those sporting MMU of version 3 and 4) allow selection of different page sizes (4, 8 or 16 kB) during ASIC design creation. And it's important to build a toolchain with page size setting that matches hardware. Otherwise user-space applications will fail on execution due to unexpected data layout/alignment etc. [Thomas: slightly improve help text, fix indentation of help text.] Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com> Cc: Anton Kolesov <akolesov@synopsys.com> Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Cc: Arnout Vandecappelle <arnout@mind.be> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Diffstat (limited to 'arch')
1 files changed, 38 insertions, 0 deletions
diff --git a/arch/Config.in.arc b/arch/Config.in.arc
index b48a90ff07..7e0ad08425 100644
--- a/arch/Config.in.arc
+++ b/arch/Config.in.arc
@@ -40,3 +40,41 @@ config BR2_GCC_TARGET_CPU
default "arc700" if BR2_arc750d
default "arc700" if BR2_arc770d
default "archs" if BR2_archs38
+ prompt "MMU Page Size"
+ default BR2_ARC_PAGE_SIZE_8K
+ help
+ MMU starting from version 3 (found in ARC 770) and now
+ version 4 (found in ARC HS38) allows the selection of the
+ page size during ASIC design creation.
+ The following options are available for MMU v3 and v4: 4kB,
+ 8kB and 16 kB.
+ The default is 8 kB (that really matches the only page size
+ in MMU v2). It is important to build a toolchain with page
+ size matching the hardware configuration. Otherwise
+ user-space applications will fail at runtime.
+config BR2_ARC_PAGE_SIZE_4K
+ bool "4KB"
+ depends on BR2_arc770d || BR2_archs38
+config BR2_ARC_PAGE_SIZE_8K
+ bool "8KB"
+ help
+ This is the one and only option available for MMUv2 and
+ default value for MMU v3 and v4.
+config BR2_ARC_PAGE_SIZE_16K
+ bool "16KB"
+ depends on BR2_arc770d || BR2_archs38
+ string
+ default "4K" if BR2_ARC_PAGE_SIZE_4K
+ default "8K" if BR2_ARC_PAGE_SIZE_8K
+ default "16K" if BR2_ARC_PAGE_SIZE_16K