From 5923c843ba0e06a90e0c0c5cc6894ac8641377e1 Mon Sep 17 00:00:00 2001
From: Simon Glass <sjg@chromium.org>
Date: Fri, 22 Jul 2016 09:22:45 -0600
Subject: [PATCH] sandbox: Add instructions about building on 32-bit machines
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>
---
board/sandbox/README.sandbox | 3 +++
include/configs/sandbox.h | 5 ++++-
2 files changed, 7 insertions(+), 1 deletion(-)
diff --git a/board/sandbox/README.sandbox b/board/sandbox/README.sandbox
index 9fe3bf171a..ed820d338e 100644
--- a/board/sandbox/README.sandbox
+++ b/board/sandbox/README.sandbox
@@ -44,6 +44,9 @@ Note:
make sandbox_defconfig all NO_SDL=1
./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
console:
diff --git a/include/configs/sandbox.h b/include/configs/sandbox.h
index 4de89f8879..197d8bb8ca 100644
--- a/include/configs/sandbox.h
+++ b/include/configs/sandbox.h
@@ -27,7 +27,10 @@
#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_LMB
--
2.39.5