[U-Boot] [PATCH v6 1/6] arm: Reduce the scope of lowlevel_init()

[Simon Glass]

This function has grown into something of a monster. Some boards are setting
up a console and DRAM here in SPL. This requires global_data which should be
set up in one place (crt0.S).

There is no need for SPL to use s_init() for anything since board_init_f()
is called immediately afterwards.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

Changes in v6:
- Make changes only when CONFIG_DM is defined, just in case

Changes in v5: None
Changes in v4: None
Changes in v3: None
Changes in v2: None

 arch/arm/cpu/armv7/lowlevel_init.S | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/arch/arm/cpu/armv7/lowlevel_init.S b/arch/arm/cpu/armv7/lowlevel_init.S
index f1aea05..427b0b1 100644
--- a/arch/arm/cpu/armv7/lowlevel_init.S
+++ b/arch/arm/cpu/armv7/lowlevel_init.S
@@ -17,10 +17,17 @@
 
 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
@@ -28,13 +35,24 @@ ENTRY(lowlevel_init)
 	bic	sp, sp, #7
 	mov	r9, sp
 #endif
+#endif
 	/*
 	 * Save the old lr(passed in ip) and the current lr to stack
 	 */
 	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}
-- 
2.2.0.rc0.207.ga3a616c