[U-Boot] [PATCH 3/3] arm: socfpga: put initial U-Boot stack into DDR

[Simon Goldschmidt]

If SPL pre-reloc stage puts the stack into DDR, U-Boot should be able to
do that, too.

The reason to do so is that this way, U-Boot initial stack can be larger
than SPL initial stack. In situations where we want to save the SPL
in SRAM for next boot without reloading, this prevents overwriting the
SPL DTB in SRAM if U-Boot stack usage gets too high.

Signed-off-by: Simon Goldschmidt <simon.k.r.goldschmidt at gmail.com>
---

 include/configs/socfpga_common.h | 20 +++++++++++++-------
 1 file changed, 13 insertions(+), 7 deletions(-)

diff --git a/include/configs/socfpga_common.h b/include/configs/socfpga_common.h
index c23b34186a..7ae3db233f 100644
--- a/include/configs/socfpga_common.h
+++ b/include/configs/socfpga_common.h
@@ -38,12 +38,23 @@
 #if ((CONFIG_SYS_BOOTCOUNT_ADDR > CONFIG_SYS_INIT_RAM_ADDR) &&	\
      (CONFIG_SYS_BOOTCOUNT_ADDR < (CONFIG_SYS_INIT_RAM_ADDR +	\
 				   CONFIG_SYS_INIT_RAM_SIZE)))
-#define CONFIG_SYS_INIT_SP_ADDR		CONFIG_SYS_BOOTCOUNT_ADDR
+#define CONFIG_SPL_STACK		CONFIG_SYS_BOOTCOUNT_ADDR
 #else
-#define CONFIG_SYS_INIT_SP_ADDR			\
+#define CONFIG_SPL_STACK			\
 	(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_SIZE)
 #endif
 
+/*
+ * U-Boot stack setup: if SPL post-reloc uses DDR stack, use it in pre-reloc
+ * phase of U-Boot, too. This prevents overwriting SPL data if stack/heap usage
+ * in U-Boot pre-reloc is higher than in SPL.
+ */
+#if defined(CONFIG_SPL_STACK_R_ADDR) && CONFIG_SPL_STACK_R_ADDR
+#define CONFIG_SYS_INIT_SP_ADDR		CONFIG_SPL_STACK_R_ADDR
+#else
+#define CONFIG_SYS_INIT_SP_ADDR		CONFIG_SPL_STACK
+#endif
+
 #define CONFIG_SYS_SDRAM_BASE		PHYS_SDRAM_1
 
 /*
@@ -274,11 +285,6 @@ unsigned int cm_get_qspi_controller_clk_hz(void);
 #define CONFIG_SYS_NAND_U_BOOT_OFFS	0x40000
 #endif
 
-/*
- * Stack setup
- */
-#define CONFIG_SPL_STACK		CONFIG_SYS_INIT_SP_ADDR
-
 /* Extra Environment */
 #ifndef CONFIG_SPL_BUILD
 
-- 
2.17.1