From: Vikas Manocha <vikas.manocha@st.com>
Date: Fri, 16 Aug 2019 16:57:44 +0000 (-0700)
Subject: board_f: reserve noncached space below malloc area
X-Git-Url: http://git.dujemihanovic.xyz/?a=commitdiff_plain;h=5f7adb5b1c02592e1a7037413a986ffdf864fcc2;p=u-boot.git

board_f: reserve noncached space below malloc area

Noncached area at present is being initialized to random space after malloc
area. It works in most the cases as it goes to stack area & stack is not
overwriting it being far from it.

Signed-off-by: Vikas Manocha <vikas.manocha@st.com>
---

diff --git a/common/board_f.c b/common/board_f.c
index 31181a9dc4..6867abc8e6 100644
--- a/common/board_f.c
+++ b/common/board_f.c
@@ -467,12 +467,29 @@ static int reserve_uboot(void)
 	return 0;
 }
 
+#ifdef CONFIG_SYS_NONCACHED_MEMORY
+static int reserve_noncached(void)
+{
+	/* round down to SECTION SIZE (typicaly 1MB) limit */
+	gd->start_addr_sp &= ~(MMU_SECTION_SIZE - 1);
+	gd->start_addr_sp -= CONFIG_SYS_NONCACHED_MEMORY;
+	debug("Reserving %dM for noncached_alloc() at: %08lx\n",
+	      CONFIG_SYS_NONCACHED_MEMORY >> 20, gd->start_addr_sp);
+
+	return 0;
+}
+#endif
+
 /* reserve memory for malloc() area */
 static int reserve_malloc(void)
 {
 	gd->start_addr_sp = gd->start_addr_sp - TOTAL_MALLOC_LEN;
 	debug("Reserving %dk for malloc() at: %08lx\n",
 	      TOTAL_MALLOC_LEN >> 10, gd->start_addr_sp);
+#ifdef CONFIG_SYS_NONCACHED_MEMORY
+	reserve_noncached();
+#endif
+
 	return 0;
 }