[U-Boot] [RFC] spl: Remove overwrite of relocated malloc limit

[Andrew F. Davis <afd@ti.com>]

spl_init on some boards is called after stack and heap relocation, on
some platforms spl_relocate_stack_gd is called to handle setting the
limit to its value CONFIG_SPL_STACK_R_MALLOC_SIMPLE_LEN when simple
SPL malloc is enabled during relocation. spl_init should then not
re-assign the old pre-relocation limit. Remove this.

Also add some debug statements that can help with find similar
problems.

Signed-off-by: Andrew F. Davis <afd@ti.com>
---
I'm not sure what the real fix should be, probably to clean-up
all this spaghetti code relating to malloc, but for now without
this patch we are stuck with the pre-relocation heap size and
boot with simple malloc is not functional on AM335x-EVM and probably
many other similar boards.

 common/malloc_simple.c | 6 +++++-
 common/spl/spl.c       | 1 -
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/common/malloc_simple.c b/common/malloc_simple.c
index 0f6bcbcc71..611400265b 100644
--- a/common/malloc_simple.c
+++ b/common/malloc_simple.c
@@ -39,10 +39,14 @@ void *memalign_simple(size_t align, size_t bytes)
 
 	addr = ALIGN(gd->malloc_base + gd->malloc_ptr, align);
 	new_ptr = addr + bytes - gd->malloc_base;
-	if (new_ptr > gd->malloc_limit)
+	if (new_ptr > gd->malloc_limit) {
+		debug("space exhausted\n");
 		return NULL;
+	}
+
 	ptr = map_sysmem(addr, bytes);
 	gd->malloc_ptr = ALIGN(new_ptr, sizeof(new_ptr));
+	debug("%lx\n", (ulong)ptr);
 
 	return ptr;
 }
diff --git a/common/spl/spl.c b/common/spl/spl.c
index a76ea3a603..aa75c93fce 100644
--- a/common/spl/spl.c
+++ b/common/spl/spl.c
@@ -237,7 +237,6 @@ int spl_init(void)
 #ifdef CONFIG_MALLOC_F_ADDR
 	gd->malloc_base = CONFIG_MALLOC_F_ADDR;
 #endif
-	gd->malloc_limit = CONFIG_SYS_MALLOC_F_LEN;
 	gd->malloc_ptr = 0;
 #endif
 	if (CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)) {
-- 
2.11.0