X-Git-Url: https://git.sur5r.net/?a=blobdiff_plain;f=arch%2Farm%2Fcpu%2Farmv7%2Flowlevel_init.S;h=427b0b132165b8003233a3280e097b02a4891e0b;hb=b050898efa6b4f0272f12885a7365f044ab4c08e;hp=0a15aa4671ba9b065d216c5b465382138a1e736f;hpb=f0df254663d44f7fd4b714542bb4602626837465;p=u-boot

diff --git a/arch/arm/cpu/armv7/lowlevel_init.S b/arch/arm/cpu/armv7/lowlevel_init.S
index 0a15aa4671..427b0b1321 100644
--- a/arch/arm/cpu/armv7/lowlevel_init.S
+++ b/arch/arm/cpu/armv7/lowlevel_init.S
@@ -8,23 +8,7 @@
  * Author :
  *	Aneesh V	<aneesh@ti.com>
  *
- * See file CREDITS for list of people who contributed to this
- * project.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
+ * SPDX-License-Identifier:	GPL-2.0+
  */
 
 #include <asm-offsets.h>
@@ -33,16 +17,24 @@
 
 ENTRY(lowlevel_init)
 	/*
-	 * Setup a temporary stack
+	 * Setup a temporary stack. Global data is not available yet.
 	 */
 	ldr	sp, =CONFIG_SYS_INIT_SP_ADDR
 	bic	sp, sp, #7 /* 8-byte alignment for ABI compliance */
+#ifdef CONFIG_DM
+	mov	r9, #0
+#else
+	/*
+	 * Set up global data for boards that still need it. This will be
+	 * removed soon.
+	 */
 #ifdef CONFIG_SPL_BUILD
-	ldr	r8, =gdata
+	ldr	r9, =gdata
 #else
-	sub	sp, #GD_SIZE
+	sub	sp, sp, #GD_SIZE
 	bic	sp, sp, #7
-	mov	r8, sp
+	mov	r9, sp
+#endif
 #endif
 	/*
 	 * Save the old lr(passed in ip) and the current lr to stack
@@ -50,7 +42,17 @@ ENTRY(lowlevel_init)
 	push	{ip, lr}
 
 	/*
-	 * go setup pll, mux, memory
+	 * Call the very early init function. This should do only the
+	 * absolute bare minimum to get started. It should not:
+	 *
+	 * - set up DRAM
+	 * - use global_data
+	 * - clear BSS
+	 * - try to start a console
+	 *
+	 * For boards with SPL this should be empty since SPL can do all of
+	 * this init in the SPL board_init_f() function which is called
+	 * immediately after this.
 	 */
 	bl	s_init
 	pop	{ip, pc}