sandbox: Rework how SDL is enabled / disabled

Given that we can use Kconfig logic directly to see if we have a program
available on the host or not, change from passing NO_SDL to instead
controlling CONFIG_SANDBOX_SDL in Kconfig directly. Introduce
CONFIG_HOST_HAS_SDL as the way to test for sdl2-config and default
CONFIG_SANDBOX_SDL on if we have that, or not.

Cc: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

1 files changed, 3 insertions, 6 deletions

diff --git a/doc/arch/sandbox/sandbox.rst b/doc/arch/sandbox/sandbox.rst
index 34c4e06d9b..e6d8403651 100644
--- a/doc/arch/sandbox/sandbox.rst
+++ b/doc/arch/sandbox/sandbox.rst
@@ -56,11 +56,8 @@ To run sandbox U-Boot use something like::
 
 Note: If you get errors about 'sdl-config: Command not found' you may need to
 install libsdl2.0-dev or similar to get SDL support. Alternatively you can
-build sandbox without SDL (i.e. no display/keyboard support) by removing
-the CONFIG_SANDBOX_SDL line in include/configs/sandbox.h or using::
-
-   make sandbox_defconfig all NO_SDL=1
-   ./u-boot
+build sandbox without SDL (i.e. no display/keyboard support) by disabling
+CONFIG_SANDBOX_SDL in the .config file.
 
 U-Boot will start on your computer, showing a sandbox emulation of the serial
 console::
@@ -84,7 +81,7 @@ To exit, type 'poweroff' or press Ctrl-C.
 Console / LCD support
 ---------------------
 
-Assuming that CONFIG_SANDBOX_SDL is defined when building, you can run the
+Assuming that CONFIG_SANDBOX_SDL is enabled when building, you can run the
 sandbox with LCD and keyboard emulation, using something like::
 
    ./u-boot -d u-boot.dtb -l