godotengine/buildroot
1
0
Fork 0
mirror of https://github.com/godotengine/buildroot.git synced 2026-01-04 06:10:16 +03:00
Code Issues Packages Projects Releases Wiki Activity

ARC: allow selection of MMU page size

Browse Source 
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>
This commit is contained in:
Alexey Brodkin
2015-07-17 12:11:42 +03:00
committed by Thomas Petazzoni
parent daa433bff6
commit 3720e28d15
2 changed files with 46 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

38
arch/Config.in.arc
View File

@@ -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