spl: Tidy up SPL/TPL malloc sizes

The current help talks about relocation which doesn't apply to SPL and
TPL. Update it to avoid confusion.

Also make the TPL size default to the same as the SPL size, since this is
more likely to be a useful value than the one used by U-Boot proper, which
may be quite a bit larger.

Signed-off-by: Simon Glass <[email protected]>

Kconfig

@@ -217,22 +217,25 @@ config SYS_MALLOC_LEN
 	  TODO: Use for other architectures
 
 config SPL_SYS_MALLOC_F_LEN
-	hex "Size of malloc() pool in SPL before relocation"
+	hex "Size of malloc() pool in SPL"
 	depends on SYS_MALLOC_F && SPL
 	default 0x2800 if RCAR_GEN3
 	default SYS_MALLOC_F_LEN
 	help
-	  Before relocation, memory is very limited on many platforms. Still,
+	  In SPL memory is very limited on many platforms. Still,
 	  we can provide a small malloc() pool if needed. Driver model in
 	  particular needs this to operate, so that it can allocate the
 	  initial serial device and any others that are needed.
 
+	  It is possible to enable CONFIG_SYS_SPL_MALLOC_START to start a new
+	  malloc() region in SDRAM once it is inited.
+
 config TPL_SYS_MALLOC_F_LEN
-	hex "Size of malloc() pool in TPL before relocation"
+	hex "Size of malloc() pool in TPL"
 	depends on SYS_MALLOC_F && TPL
-	default SYS_MALLOC_F_LEN
+	default SPL_SYS_MALLOC_F_LEN
 	help
-	  Before relocation, memory is very limited on many platforms. Still,
+	  In TPL memory is very limited on many platforms. Still,
 	  we can provide a small malloc() pool if needed. Driver model in
 	  particular needs this to operate, so that it can allocate the
 	  initial serial device and any others that are needed.