update

HOWTO.md

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+## HOWTO:
+This document describes how to configure and use the periperals of your board from Linux.
+
+**Configure/Use the Leds**:
+Configure the Leds GPIOs as outputs:
+````
+$echo 508 > /sys/class/gpio/export
+$echo out > /sys/class/gpio/gpiochip508/direction
+````
+Set the Leds value:
+````
+$echo 0 > /sys/class/gpio/gpio508/value
+$echo 1 > /sys/class/gpio/gpio508/value
+````
+
+**Configure/Use the PWM RGB Led**:
+````
+$ cd /sys/class/pwm/pwmchip0
+$ echo 0 > export
+$ cd pwm0
+$ echo 100 > period
+$ echo 50 > duty_cycle
+$ echo 1 > enable
+````
+
+This should turn configure the Led with 50% PWM that you can adjust by changing `duty_cycle` value from `0` to the configured `period`.
+
+**Configure/Use Ethernet**:
+Verify that the `eth0` ethernet device is present:
+`$ ifconfig -a`:
+````
+eth0      Link encap:Ethernet  HWaddr C6:6A:FB:04:6A:B9
+          BROADCAST MULTICAST  MTU:1500  Metric:1
+          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
+          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
+          collisions:0 txqueuelen:1000
+          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
+
+lo        Link encap:Local Loopback
+          inet addr:127.0.0.1  Mask:255.0.0.0
+          inet6 addr: ::1/128 Scope:Host
+          UP LOOPBACK RUNNING  MTU:65536  Metric:1
+          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
+          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
+          collisions:0 txqueuelen:1000
+          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
+
+sit0      Link encap:IPv6-in-IPv4
+          NOARP  MTU:1480  Metric:1
+          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
+          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
+          collisions:0 txqueuelen:1000
+          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
+````
+Configure it:
+`$ ifconfig eth0 192.168.1.50`
+
+Verify that you can ping another machine on your network:
+`$ ping 192.168.1.100`:
+````
+PING 192.168.1.100 (192.168.1.100): 56 data bytes
+64 bytes from 192.168.1.100: seq=0 ttl=64 time=19.839 ms
+64 bytes from 192.168.1.100: seq=1 ttl=64 time=4.585 ms
+64 bytes from 192.168.1.100: seq=2 ttl=64 time=8.510 ms
+64 bytes from 192.168.1.100: seq=3 ttl=64 time=12.522 ms
+^C
+--- 192.168.1.100 ping statistics ---
+4 packets transmitted, 4 packets received, 0% packet loss
+round-trip min/avg/max = 4.585/11.364/19.839 ms
+````
+
+**Configure/Use the SPI Flash:**
+There should be a `/dev/mtd0` that you can read from/write to directly from bash, i.e.,:
+```
+$ cat /dev/mtd0
+```
+Or even better, to see the data clearly:
+
+```
+$ dd if=/dev/mtd0 count=6 bs=1 status=none | hexdump
+```
+
+Before writing you should erase the flash first. This requires `BR2_PACKAGE_MTD` and `BR2_PACKAGE_MTD_JFFS_UTILS` to be enabled in the buildroot config.
+
+```
+$ flash_erase /dev/mtd0 0 1
+$ echo -ne "\x01\x01" > /dev/mtd0
+```
+
+**Configure/Use the SDCard:**
+TODO

buildroot/boot.json

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+{
+	"Image":        "0x40000000",
+	"rootfs.cpio":  "0x40800000",
+	"rv32.dtb":     "0x41000000",
+	"emulator.bin":  "0x41100000"
+}