Add sigmastar-unbrick.md

en/sigmastar-unbrick.md

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+# OpenIPC Wiki
+[Table of Content](../index.md)
+
+Sigmastar unbrick
+---
+
+**Locate the Sigmastar UART output and connect it to the Raspberry Pi I2C:**
+- TX -> SDA I2C (GPIO2)
+- RX -> SCL I2C (GPIO3)
+- GND -> GND
+
+![](../images/sigmastar-uart.jpg)
+
+![](../images/sigmastar-raspberry.png)
+
+![](../images/sigmastar-example.jpg)
+
+---
+
+**Enable Raspberry I2C and install I2C tools:**
+```
+sudo raspi-config
+sudo apt-get install -y i2c-tools
+```
+
+**Download snander-mstar programmer:**
+```
+wget https://github.com/viktorxda/snander-mstar/releases/download/latest/snander
+chmod 755 snander
+```
+
+---
+
+**Use i2cdetect to check for the device:**
+- 0x49 -> isp programming
+- 0x59 -> serial debugging
+```
+sudo i2cdetect -y 1
+```
+
+![](../images/sigmastar-detect.png)
+
+**Check the device spinand with snander:**
+```
+./snander -i
+```
+
+![](../images/sigmastar-check.png)
+
+**Read uboot with snander:**
+```
+./snander -a 0x2C0000 -l 0x060000 -r uboot0.bin
+```
+
+![](../images/sigmastar-read.png)
+
+**Erase uboot partition:**
+```
+./snander -a 0x2C0000 -l 0x060000 -e
+```
+
+**Write and verify new uboot:**
+```
+./snander -a 0x2C0000 -l 0x060000 -w uboot0_new.bin -v
+```
+
+![](../images/sigmastar-write.png)
+
+---
+
+**Partition table for spinand:**
+```
+CIS		0x0000000-0x0020000	128KB
+IPL0		0x0140000-0x0200000	768KB
+IPL_CUST0	0x0200000-0x0260000	384KB
+IPL_CUST1	0x0260000-0x02C0000	384KB
+UBOOT0		0x02C0000-0x0320000	384KB
+UBOOT1		0x0320000-0x0380000	384KB
+ENV		0x0380000-0x03C0000	256KB
+KERNEL		0x03C0000-0x08C0000	5120KB
+RECOVERY	0x08C0000-0x0DC0000	5120KB
+rootfs		0x0DC0000-0x13C0000	6144KB
+UBI		0x13C0000-0x8000000	110848KB
+```
+
+**Read partitions:**
+```
+./snander -a 0x000000 -l 0x020000 -r GCIS.bin
+./snander -a 0x140000 -l 0x0C0000 -r IPL.bin
+./snander -a 0x200000 -l 0x060000 -r IPL_CUST1.bin
+./snander -a 0x260000 -l 0x060000 -r IPL_CUST2.bin
+./snander -a 0x2C0000 -l 0x060000 -r UBOOT0.bin
+./snander -a 0x320000 -l 0x060000 -r UBOOT1.bin
+./snander -a 0x380000 -l 0x040000 -r ENV.bin
+```
+
+**Write partitions:**
+```
+./snander -a 0x000000 -l 0x020000 -e
+./snander -a 0x000000 -l 0x020000 -w GCIS.bin -v
+./snander -a 0x140000 -l 0x0C0000 -e
+./snander -a 0x140000 -l 0x0C0000 -w IPL.bin -v
+./snander -a 0x200000 -l 0x060000 -e
+./snander -a 0x200000 -l 0x060000 -w IPL_CUST1.bin -v
+./snander -a 0x260000 -l 0x060000 -e
+./snander -a 0x260000 -l 0x060000 -w IPL_CUST2.bin -v
+./snander -a 0x2C0000 -l 0x060000 -e
+./snander -a 0x2C0000 -l 0x060000 -w UBOOT0.bin -v
+./snander -a 0x320000 -l 0x060000 -e
+./snander -a 0x320000 -l 0x060000 -w UBOOT1.bin -v
+./snander -a 0x380000 -l 0x040000 -e
+./snander -a 0x380000 -l 0x040000 -w ENV.bin -v
+```