include/config_fallbacks.h: add default for CONFIG_SYS_CBSIZE

CONFIG_SYS_CBSIZE contains the buffer size for input for the
console. The vast majority of platforms define them to some reasonable
value (256, 512 or 1024 bytes), and it is quite annoying to repeat
this definition for all platforms while it isn't really HW-related.

Therefore, let's provide a sane fallback value in config_fallbacks.h,
so that platforms can rely on it instead of having to explicitly
define it.

We use 1024 when KGDB is enabled, and 256 otherwise, which is what the
majority of the platforms are doing.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: Tom Rini <trini@konsulko.com>

diff --git a/include/config_fallbacks.h b/include/config_fallbacks.h
index d1bde5f..07df996 100644 (file)
--- a/include/config_fallbacks.h
+++ b/include/config_fallbacks.h
@@ -72,6 +72,15 @@
 #define CONFIG_LIB_RAND
 #endif
 
+/* Console I/O Buffer Size */
+#ifndef CONFIG_SYS_CBSIZE
+#if defined(CONFIG_CMD_KGDB)
+#define CONFIG_SYS_CBSIZE      1024
+#else
+#define CONFIG_SYS_CBSIZE      256
+#endif
+#endif
+
 #ifndef CONFIG_SYS_PBSIZE
 #define CONFIG_SYS_PBSIZE      (CONFIG_SYS_CBSIZE + 128)
 #endif