zunq: add sdram driver

sys/src/9/zynq/dat.h

@@ -60,7 +60,6 @@ enum
 struct Confmem
 {
 	uintptr	base;
-	uintptr	limit;
 	usize	npage;
 	uintptr	kbase;
 	uintptr	klimit;
@@ -70,7 +69,7 @@ struct Conf
 {
 	ulong	nmach;		/* processors */
 	ulong	nproc;		/* processes */
-	Confmem	mem[1];		/* physical memory */
+	Confmem	mem[2];		/* physical memory */
 	ulong	npage;		/* total physical pages of memory */
 	usize	upages;		/* user page pool */
 	ulong	copymode;	/* 0 is copy on write, 1 is copy on reference */

sys/src/9/zynq/main.c

@@ -177,10 +177,14 @@ confinit(void)
 	conf.ialloc = 16*1024*1024;
 	conf.nimage = 200;
 	conf.mem[0].base = PGROUND((ulong)end - KZERO);
-	conf.mem[0].limit = 1024*1024*1024;
+	conf.mem[0].npage = (1024*1024*1024 - conf.mem[0].base) >> PGSHIFT;
+
+	ramdiskinit();
+
 	conf.npage = 0;
 	for(i = 0; i < nelem(conf.mem); i++)
-		conf.npage += conf.mem[i].npage = (conf.mem[i].limit - conf.mem[i].base) >> PGSHIFT;
+		conf.npage += conf.mem[i].npage;
+
 	kmem = 200*1024*1024;
 	conf.upages = conf.npage - kmem/BY2PG;
 	kmem -= conf.upages*sizeof(Page)

sys/src/9/zynq/zynq

@@ -34,6 +34,7 @@ link
 misc
 	uartzynq
 	sdmmc		emmc
+	sdram
 
 ip
 	tcp