X-Git-Url: https://git.sur5r.net/?a=blobdiff_plain;f=arch%2Farm%2Fcpu%2Farmv7%2Flowlevel_init.S;h=427b0b132165b8003233a3280e097b02a4891e0b;hb=b050898efa6b4f0272f12885a7365f044ab4c08e;hp=f1aea05c9094677c8e7c6bf8126d8d4ab970ba30;hpb=c0cae2e24552d57f3e2f841ec235453413cd7389;p=u-boot

diff --git a/arch/arm/cpu/armv7/lowlevel_init.S b/arch/arm/cpu/armv7/lowlevel_init.S
index f1aea05c90..427b0b1321 100644
--- a/arch/arm/cpu/armv7/lowlevel_init.S
+++ b/arch/arm/cpu/armv7/lowlevel_init.S
@@ -17,16 +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	r9, =gdata
 #else
 	sub	sp, sp, #GD_SIZE
 	bic	sp, sp, #7
 	mov	r9, sp
+#endif
 #endif
 	/*
 	 * Save the old lr(passed in ip) and the current lr to stack
@@ -34,7 +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}