M28: Add memory detection into SPL
This code allows the DDR DRAM size to be detected at runtime. The RAM size is
stored into two scratch registers, from which it is then fetched in U-Boot.
Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Wolfgang Denk <wd@denx.de>
Cc: Detlev Zundel <dzu@denx.de>
diff --git a/board/denx/m28evk/m28evk.c b/board/denx/m28evk/m28evk.c
index 118e222..168ceeb 100644
--- a/board/denx/m28evk/m28evk.c
+++ b/board/denx/m28evk/m28evk.c
@@ -63,10 +63,24 @@
return 0;
}
+#define HW_DIGCTRL_SCRATCH0 0x8001c280
+#define HW_DIGCTRL_SCRATCH1 0x8001c290
int dram_init(void)
{
- /* dram_init must store complete ramsize in gd->ram_size */
- gd->ram_size = get_ram_size((long *)PHYS_SDRAM_1, PHYS_SDRAM_1_SIZE);
+ uint32_t sz[2];
+
+ sz[0] = readl(HW_DIGCTRL_SCRATCH0);
+ sz[1] = readl(HW_DIGCTRL_SCRATCH1);
+
+ if (sz[0] != sz[1]) {
+ printf("MX28:\n"
+ "Error, the RAM size in HW_DIGCTRL_SCRATCH0 and\n"
+ "HW_DIGCTRL_SCRATCH1 is not the same. Please\n"
+ "verify these two registers contain valid RAM size!\n");
+ hang();
+ }
+
+ gd->ram_size = sz[0];
return 0;
}