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sandbox: Add instructions about building on 32-bit machines

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Sandbox is built with 64-bit ints by default. This doesn't work properly on
32-bit machines.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
This commit is contained in:
Simon Glass
2016-07-22 09:22:45 -06:00
committed by Tom Rini
parent 713fb2dcb2
commit 5923c843ba
2 changed files with 7 additions and 1 deletions
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3
board/sandbox/README.sandbox
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@@ -44,6 +44,9 @@ Note:
make sandbox_defconfig all NO_SDL=1 make sandbox_defconfig all NO_SDL=1
./u-boot ./u-boot
If you are building on a 32-bit machine you may get errors from __ffs.h
about shifting more than the machine word size. Edit the config file
include/configs/sandbox.h and change CONFIG_SANDBOX_BITS_PER_LONG to 32.
U-Boot will start on your computer, showing a sandbox emulation of the serial U-Boot will start on your computer, showing a sandbox emulation of the serial
console: console:

5
include/configs/sandbox.h
View File

@@ -27,7 +27,10 @@
#define CONFIG_SYS_STDIO_DEREGISTER #define CONFIG_SYS_STDIO_DEREGISTER
/* Number of bits in a C 'long' on this architecture */ /*
* Number of bits in a C 'long' on this architecture. Set this to 32 when
* building on a 32-bit machine.
*/
#define CONFIG_SANDBOX_BITS_PER_LONG 64 #define CONFIG_SANDBOX_BITS_PER_LONG 64
#define CONFIG_LMB #define CONFIG_LMB