[target][zybo] add sysparam and ptable support

Add some code in target init that sets up the spi flash ptable
and sysparam block.

project/zybo-test.mk

@@ -7,7 +7,12 @@ MODULES += \
 	app/stringtests \
 	app/shell \
 	lib/cksum \
-	lib/debugcommands
+	lib/sysparam \
+	lib/debugcommands \
+	lib/ptable \
+
+GLOBAL_DEFINES += \
+	SYSPARAM_ALLOW_WRITE=1
 
 include $(LOCAL_DIR)/zybo.mk
 

target/zybo/target.c

@@ -20,7 +20,10 @@
  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
+#include <stdio.h>
 #include <dev/spiflash.h>
+#include <lib/ptable.h>
+#include <lib/sysparam.h>
 
 void target_early_init(void)
 {
@@ -30,5 +33,40 @@ void target_init(void)
 {
     /* zybo has a spiflash on qspi */
     spiflash_detect();
+
+    bdev_t *spi = bio_open("spi0");
+
+#if WITH_LIB_PTABLE && WITH_LIB_SYSPARAM
+    if (spi) {
+        /* find or create a partition table at the start of flash */
+        if (ptable_scan(spi, 0) < 0) {
+            ptable_create_default(spi, 0);
+        }
+
+        struct ptable_entry entry = { 0 };
+
+        if (ptable_find("sysparam", &entry) < 0) {
+            /* didn't find sysparam partition, create it */
+            ptable_add("sysparam", 0x1000, 0x1000, 0);
+            ptable_find("sysparam", &entry);
+        }
+
+        printf("flash partition table:\n");
+        ptable_dump();
+
+        if (entry.length > 0) {
+            sysparam_scan(spi, entry.offset, entry.length);
+
+#if SYSPARAM_ALLOW_WRITE
+            /* for testing purposes, put at least one sysparam value in */
+            if (sysparam_add("dummy", "value", sizeof("value")) >= 0) {
+                sysparam_write();
+            }
+#endif
+
+            sysparam_dump(true);
+        }
+    }
+#endif
 }