arm: zynq: Add mini u-boot configuration for zynq

Add configuration files/dtses for mini u-boot configurations which runs
out of OCM.

ram top is calculated from 0 that's why +#define CONFIG_SYS_SDRAM_BASE
0xfffc0000
+#define CONFIG_SYS_SDRAM_SIZE  0x40000
was hardcoded.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/include/configs/zynq_cse.h b/include/configs/zynq_cse.h
new file mode 100644
index 0000000..dd65b52
--- /dev/null
+++ b/include/configs/zynq_cse.h
@@ -0,0 +1,53 @@
+/*
+ * (C) Copyright 2013 - 2017 Xilinx.
+ *
+ * Configuration settings for the Xilinx Zynq CSE board.
+ * See zynq-common.h for Zynq common configs
+ *
+ * SPDX-License-Identifier:     GPL-2.0+
+ */
+
+#ifndef __CONFIG_ZYNQ_CSE_H
+#define __CONFIG_ZYNQ_CSE_H
+
+#define CONFIG_SKIP_LOWLEVEL_INIT
+#define CONFIG_SYS_DCACHE_OFF
+#define CONFIG_SYS_ICACHE_OFF
+
+#include <configs/zynq-common.h>
+
+/* Undef unneeded configs */
+#undef CONFIG_EXTRA_ENV_SETTINGS
+#undef CONFIG_BOARD_LATE_INIT
+#undef CONFIG_BOOTCOMMAND
+#undef CONFIG_ENV_SIZE
+#undef CONFIG_CMDLINE_EDITING
+#undef CONFIG_AUTO_COMPLETE
+#undef CONFIG_ZLIB
+#undef CONFIG_GZIP
+
+#undef CONFIG_SYS_LONGHELP
+
+#undef CONFIG_SYS_CBSIZE
+#undef CONFIG_BOOTM_VXWORKS
+#undef CONFIG_BOOTM_LINUX
+
+#define CONFIG_SYS_CBSIZE	1024
+
+#define CONFIG_ENV_SIZE		400
+#undef CONFIG_SYS_INIT_RAM_ADDR
+#undef CONFIG_SYS_INIT_RAM_SIZE
+#define CONFIG_SYS_INIT_RAM_ADDR	0xFFFDE000
+#define CONFIG_SYS_INIT_RAM_SIZE	0x1000
+#undef CONFIG_SPL_BSS_START_ADDR
+#undef CONFIG_SPL_BSS_MAX_SIZE
+#define CONFIG_SPL_BSS_START_ADDR	0x20000
+#define CONFIG_SPL_BSS_MAX_SIZE		0x8000
+
+#undef CONFIG_SYS_MALLOC_LEN
+#define CONFIG_SYS_MALLOC_LEN	0x1000
+
+#define CONFIG_SYS_SDRAM_BASE	0xfffc0000
+#define CONFIG_SYS_SDRAM_SIZE	0x40000
+
+#endif /* __CONFIG_ZYNQ_CSE_H */