Updated README.md, tweaked kernel boot parameters, and made xylonfb o…

…ptional.

README.md

@@ -10,6 +10,14 @@ https://github.com/q3k/zturn-stuff
 
 Based on the above the information, ZTurn support was added to newer versions of u-boot-xlnx and linux-xlnx, much newer than what Myir was running.
 
-Known issues:
+This repository does not (as yet) supply any bitstreams. The original bitstreams released by MYIR should work (7z020-hdmi.bit was tested), which can be extracted from MYIR supplied CD (also available via links in the zturn-stuff repo listed above). Compiling the mys-xc7z020-trd project also resulted in a working bitstream.
+
+To create a custom bitstream from scratch, start with https://wiki.hackerspace.pl/projects:zturn-hackers:helloworld as the resulting bitstream boots just fine, albeit without the LED, accelerometer and temperature sensor.
 
+Tweaks
+------
+The MYIR images/bitstreams included support vir xylonfb. To enable kernel support for zturn modified linux-xlnx, uncomment the lines indicated at the bottom of meta-zturn/recipes-kernel/linux/linux-xlnx_4.6.bb.
+
+Known issues:
+------------
 Connman takes ages to initialise, apparantly because it is blocking on "random: nonblocking pool is initialized". Added haveged to the image, and tweaked connman.service to at least not block log-in.

conf/machine/zturn-zynq7.conf

@@ -14,7 +14,5 @@ SPL_BINARY = "boot.bin"
 
 SERIAL_CONSOLE = "115200 ttyPS0"
 
-KERNEL_DEVICETREE = "zynq-zturn.dtb zynq-zturn-xylon.dtb"
-
 IMAGE_BOOT_FILES += "boot.bin ${KERNEL_IMAGETYPE}-zynq-zturn.dtb ${KERNEL_IMAGETYPE}-zynq-zturn-xylon.dtb"
 

recipes-bsp/u-boot/u-boot-xlnx/u-boot-xlnx-zturn.patch

@@ -127,7 +127,7 @@
 +
 +#include <configs/zynq-common.h>
 +
-+#define CONFIG_BOOTARGS "console=ttyPS0,115200 root=/dev/mmcblk0p2 rootfstype=ext4 rw earlyprintk"
++#define CONFIG_BOOTARGS "console=ttyPS0,115200 root=/dev/mmcblk0p2 rootfstype=ext4 rw earlyprintk rootwait"
 +
 +#endif /* __CONFIG_ZYNQ_ZED_H */
 --- /dev/null

recipes-kernel/linux/linux-xlnx_4.6.bb

@@ -11,5 +11,10 @@ SRC_URI_append_zybo-linux-bd-zynq7 = " \
 	"
 
 SRC_URI_append = " file://linux-xlnx-zturn.patch \
-	file://linux-xlnx-zturn-xylon.patch \
 	file://defconfig"
+
+KERNEL_DEVICETREE = "zynq-zturn.dtb"
+
+# If xylonfb support is desired, uncomment the following lines:
+#SRC_URI_append += " file://linux-xlnx-zturn-xylon.patch"
+#KERNEL_DEVICETREE += " zynq-zturn-xylon.dtb"