cli: Reduce size of readline buffers in SPL

Normally, readline is not used int SPL. However, it may be useful to
enable the Freescale DDR interactive mode in SPL, while U-Boot is still
executing from SRAM. The default settings for readline result in a large
buffer being allocated. Reduce the size of the maximum input line, and
the number of lines of scrollback when building for SPL.

Signed-off-by: Sean Anderson <sean.anderson@seco.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

common/cli_readline.c

@@ -72,8 +72,13 @@ static char *delete_char (char *buffer, char *p, int *colp, int *np, int plen)
 #define getcmd_getch()		getchar()
 #define getcmd_cbeep()		getcmd_putch('\a')
 
+#ifdef CONFIG_SPL_BUILD
+#define HIST_MAX		3
+#define HIST_SIZE		32
+#else
 #define HIST_MAX		20
 #define HIST_SIZE		CONFIG_SYS_CBSIZE
+#endif
 
 static int hist_max;
 static int hist_add_idx;