[PATCH] board_init: Do not reserve MALLOC_F area on stack if non-zero MALLOC_F_ADDR

[Marek Vasut]

In case the MALLOC_F_ADDR is set to non-zero value, the early malloc area is
not going to be placed just below stack top, but elsewhere. Do not reserve
MALLOC_F bytes in this case, as that wastes stack space and may even cause
insufficient stack space in SPL.

This functionality is particularly useful on i.MX8M, where the insufficient
stack space can be triggered.

Signed-off-by: Marek Vasut <marex at denx.de>
Cc: Albert ARIBAUD <albert.u.boot at aribaud.net>
Cc: Fabio Estevam <festevam at denx.de>
Cc: Peng Fan <peng.fan at nxp.com>
Cc: Simon Glass <sjg at chromium.org>
Cc: Stefano Babic <sbabic at denx.de>
Cc: Thomas Chou <thomas at wytron.com.tw>
Cc: Tom Rini <trini at konsulko.com>
---
 common/init/board_init.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/common/init/board_init.c b/common/init/board_init.c
index eab5ee13953..6a550261778 100644
--- a/common/init/board_init.c
+++ b/common/init/board_init.c
@@ -78,8 +78,10 @@ __weak void board_init_f_init_stack_protection(void)
 ulong board_init_f_alloc_reserve(ulong top)
 {
 	/* Reserve early malloc arena */
+#ifndef CONFIG_MALLOC_F_ADDR
 #if CONFIG_VAL(SYS_MALLOC_F_LEN)
 	top -= CONFIG_VAL(SYS_MALLOC_F_LEN);
+#endif
 #endif
 	/* LAST : reserve GD (rounded up to a multiple of 16 bytes) */
 	top = rounddown(top-sizeof(struct global_data), 16);
-- 
2.35.1