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zunq: add sdram driver

--- a/sys/src/9/zynq/dat.h

+++ b/sys/src/9/zynq/dat.h

@@ -60,7 +60,6 @@

 struct Confmem

 {

 	uintptr	base;

-	uintptr	limit;

 	usize	npage;

 	uintptr	kbase;

 	uintptr	klimit;

@@ -70,7 +69,7 @@

 {

 	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 */

--- a/sys/src/9/zynq/main.c

+++ b/sys/src/9/zynq/main.c

@@ -177,10 +177,14 @@

 	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)

--- a/sys/src/9/zynq/zynq

+++ b/sys/src/9/zynq/zynq

@@ -34,6 +34,7 @@

 misc

 	uartzynq

 	sdmmc		emmc

+	sdram

 ip

 	tcp