On 10/14/22 10:43, Michal Suchánek wrote:
On Fri, Oct 14, 2022 at 05:05:26AM +0200, Heinrich Schuchardt wrote:
On 10/13/22 22:28, Michal Suchanek wrote:
Currently sandbox configuration defautls to 64bit and there is no
automation for building 32bit sandbox on 32bit hosts.
cpp does not know about target specification, code needs to be compiled
to determine integer width.
Add a test program that prints the integer width, and a make target that
aligns the sandbox configuration with the result.
Signed-off-by: Michal Suchanek <msucha...@suse.de>
---
Makefile | 6 ++++++
doc/arch/sandbox.rst | 16 +++++++++++-----
test/py/conftest.py | 1 +
tools/Makefile | 2 ++
tools/bits-per-long.c | 14 ++++++++++++++
5 files changed, 34 insertions(+), 5 deletions(-)
create mode 100644 tools/bits-per-long.c
diff --git a/Makefile b/Makefile
index 3866cc62f9..e5463573f3 100644
--- a/Makefile
+++ b/Makefile
@@ -2166,6 +2166,12 @@ tools-all: envtools tools ;
cross_tools: export CROSS_BUILD_TOOLS=y
cross_tools: tools ;
+PHONY += set_host_bits
+set_host_bits: tools
+ $(Q)sed -i -e /CONFIG_HOST_$$($(objtree)/tools/bits-per-long)BIT/d
$(KCONFIG_CONFIG)
+ $(Q)sed -i -E -e "s/CONFIG_HOST_(..)BIT=y/# CONFIG_HOST_\1BIT is not
set/" $(KCONFIG_CONFIG)
+ $(Q)echo CONFIG_HOST_$$($(objtree)/tools/bits-per-long)BIT=y >>
$(KCONFIG_CONFIG)
+
.PHONY : CHANGELOG
CHANGELOG:
git log --no-merges U-Boot-1_1_5.. | \
diff --git a/doc/arch/sandbox.rst b/doc/arch/sandbox.rst
index 068d4a3be4..d751205eba 100644
--- a/doc/arch/sandbox.rst
+++ b/doc/arch/sandbox.rst
@@ -33,9 +33,11 @@ machines.
There are two versions of the sandbox: One using 32-bit-wide integers, and
one
using 64-bit-wide integers. The 32-bit version can be build and run on either
-32 or 64-bit hosts by either selecting or deselecting CONFIG_SANDBOX_32BIT; by
-default, the sandbox it built for a 32-bit host. The sandbox using 64-bit-wide
-integers can only be built on 64-bit hosts.
+32 or 64-bit hosts by either selecting or deselecting HOST_64BIT; by
+default, the sandbox it built for a 64-bit host. The sandbox using 64-bit-wide
+integers can only be built on 64-bit hosts. There is no automation for ensuring
+32bit build on 32bit hosts - use ``make set_host_bits`` to adjust the sandbox
+config.
Note that standalone/API support is not available at present.
@@ -51,7 +53,9 @@ Basic Operation
To run sandbox U-Boot use something like::
- make sandbox_defconfig all
+ make sandbox_defconfig
+ make set_host_bits
+ make all
Thanks for addressing the problem of sandbox bitness.
We should not make building the sandbox more complicated. You could
integrate building set_host_bits into an existing target like u-boot.cfg:.
Overall an approach with an external program is too complicated.
CONFIG_HOST_32BIT and CONFIG_HOST_64BIT are used to define
CONFIG_SANDBOX_BITS_PER_LONG.
And for making SANDBOX64 depend on 64bit build.
Sandbox64 is about the width of phys_addr_t and not about the bitness of
the build. sandbox64_defconfig builds fine on ilp32 and many aspects
work there.
We should test that 64bit phys_addr_t works on ilp32 systems. Sandbox64
would we the right way to do this.
Best regards
Heinrich
We could add
#ifndef __LP64__
#undef SANDBOX_BITS_PER_LONG
#define SANDBOX_BITS_PER_LONG 32
#endif
If we are willing to depend on this define which is clearly named as
compiler-internal we could do similar to cc-option to run something like
$(CC) -dM -E - < /dev/null | grep -q _LP64
to the top of arch/sandbox/include/asm/posix_types.h and use
#if defined(CONFIG_HOST_64BIT) && defined(__LP64__)
in drivers/misc/swap_case.c to solve the problem. This demonstrates that
CONFIG_HOST_32BIT and CONFIG_HOST_64BIT are superfluous symbols.
Not really.
Thanks
Michal
