x86: Add basic Intel Quark processor support

[people/ms/u-boot.git] / arch / x86 / cpu / quark / dram.c

diff --git a/arch/x86/cpu/quark/dram.c b/arch/x86/cpu/quark/dram.c
new file mode 100644 (file)
index 0000000..fbdc3cd
--- /dev/null
+++ b/arch/x86/cpu/quark/dram.c
@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/post.h>
+#include <asm/arch/quark.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+int dram_init(void)
+{
+       /* hardcode the DRAM size for now */
+       gd->ram_size = DRAM_MAX_SIZE;
+       post_code(POST_DRAM);
+
+       return 0;
+}
+
+void dram_init_banksize(void)
+{
+       gd->bd->bi_dram[0].start = 0;
+       gd->bd->bi_dram[0].size = gd->ram_size;
+}
+
+/*
+ * This function looks for the highest region of memory lower than 4GB which
+ * has enough space for U-Boot where U-Boot is aligned on a page boundary.
+ * It overrides the default implementation found elsewhere which simply
+ * picks the end of ram, wherever that may be. The location of the stack,
+ * the relocation address, and how far U-Boot is moved by relocation are
+ * set in the global data structure.
+ */
+ulong board_get_usable_ram_top(ulong total_size)
+{
+       return gd->ram_size;
+}