diff options
| author | Alexey Brodkin <Alexey.Brodkin@synopsys.com> | 2015-07-17 12:11:42 +0300 |
|---|---|---|
| committer | Thomas Petazzoni <thomas.petazzoni@free-electrons.com> | 2015-07-18 14:07:35 +0200 |
| commit | 3720e28d1595ea0fea349009d7b0360914f32ef6 (patch) | |
| tree | 7c4443ced649ef949507521ea0cdad3aef66084c /arch | |
| parent | daa433bff6d2d9934705feacd3619a7618d13ae5 (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')
| -rw-r--r-- | arch/Config.in.arc | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/arch/Config.in.arc b/arch/Config.in.arc index b48a90ff0..7e0ad0842 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 + +choice + 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 + +endchoice + +config BR2_ARC_PAGE_SIZE + 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 |