Update flashinguboot.md

rework for better understandability

hacks/flashinguboot.md

@@ -1,92 +1,89 @@
-# Flashing an Open-Source U-Boot
+# Flashing an open source U-Boot bootloader
 
 ## What benefits does this open source bootloader have?
 
-1. You can use H264 FullHD Streaming (1920x1080)(128MB devices only)
-2. You can boot your own kernel/rootfs/whatever from MicroSD
+1. You can use H264 FullHD streaming (1920x1080)(on 128MB devices only)
+2. You can boot your own kernel/rootfs from MicroSD
 3. You can change your kernel boot-parameters (uEnv.txt)
 4. You can flash your NAND using this bootloader
-5. It should work on nearly all T20 based devices.
+5. It should work on most T20 based devices.
 6. The parameters could be changed through fw_printenv
-7. It is completely open source - Check the source here: https://github.com/Dafang-Hacks/uboot
-
+7. It is completely [open source](https://github.com/Dafang-Hacks/uboot)
 
 ## What are the disadvantages?
-You can brick your device, if you flash the wrong u-boot. I am not taking any responsibility for that!
+If you flash the wrong u-boot, you can brick your device. I am not taking any responsibility for that!
 
 ## Requirements:
 
-1. Find out how much RAM your device have by running following command via SSH:
+1. Determine how much RAM your device has by running following command via SSH:
 ```$bash
-[root@DafangHacks:~]# cat /proc/cmdline 
+cat /proc/cmdline 
 ```
 
-
-You will get an output similar to that:
+You should get an output like this:
 
 ```$bash
 console=ttyS1,115200n8 mem=104M@0x0 ispmem=8M@0x6800000 rmem=16M@0x7000000 init=/linuxrc root=/dev/mmcblk0p2 rootwait rootfstype=ext4 rw mtdparts=jz_sfc:256k(boot),2048k(kernel),3392k(root),640k(driver),4736k(appfs),2048k(backupk),640k(backupd),2048k(backupa),256k(config),256k(para),-(flag)
 ```
 
-Count together the values from each "mem"-section:
+Sum up the values from each "mem"-section:
 
 mem = 104M
 
 rmem = 16M
 
 ispmem = 8M
 
--> Together 128M -> You have a 128Mb Ram Device
+-> Together 128M -> You have a device with 128 Mb RAM.
 
-## Flashing U-Boot:
+## Flashing the U-Boot bootloader:
 
 1. Login via SSH
-2. Get one of the following Files according to your amount of Ram & your device:
-https://github.com/Dafang-Hacks/uboot/tree/master/compiled_bootloader
-
-3. Put the File to your microsd
-4. **Verify the MD5 Hash of the file!! Do not skip this step, or you may brick your cam!**
-3. Run following command
+2. Get the correct [bootloader](https://github.com/Dafang-Hacks/uboot/tree/master/compiled_bootloader) for your device and RAM size.
+3. Put the bootloader file on your microsd
+4. **Verify the MD5 hash of the file!! Do not skip this step or you may brick your camera!**
+3. Run following commands
 
 ```bash
 flash_eraseall /dev/mtd0
+```
+```bash
 dd if=<filename.bin> of=/dev/mtd0
 ```
+Don't do anything stupid inbetween.
+If you crash your camera, you end up without a working bootloader.
 
+## Verify that the U-Boot-Loader works correctly
+1. Get an uEnv.bootfromnand.txt file from *__* this repository. 
+2. Rename the uEnv.bootfromnand.txt to uEnv.txt
+3. Reboot your camera
 
-## Verifying the U-Boot-Loader
-1. Get a uEnv.bootfromnand.txt file from*__* this repository. 
-1. Rename the uEnv.bootfromnand.txt to uEnv.txt
-2. Boot your camera
-
-The bootloader is configured to enable the blue-led if it takes the configuration from the uEnv.txt as soon as it boots up.
+The bootloader is configured to enable the blue led if it has found a valid uEnv.txt during boot up.
 Take a look at your LED when it first turns on.
 
-If it turns yellow -> The normal configuration is being taken
+If the led turns yellow -> The default configuration is used.
 
-If it turns blue -> Custom Configuration from uEnv.txt is being taken.
+If the led turns blue -> The custom configuration from uEnv.txt is used.
 
-If its not turning blue despite that you have a uEnv.txt on your microsd - try to format it as FAT16 and try again
+If the led is not turning blue despite having an uEnv.txt on your microsd - try to format the sdcard as FAT16 and try again.
 
 
-## Turning on FULLHD(128Mb Devices only):
+## Enable FullHD (on 128 Mb devices only):
 
 Open up the uEnv.txt file and change the "boot-line" from
 
-mem=104M@0x0 ispmem=8M@0x6800000 rmem=16M@0x7000000
+`mem=104M@0x0 ispmem=8M@0x6800000 rmem=16M@0x7000000`
 
 to
 
-mem=87M@0x0 ispmem=9M@0x5700000 rmem=32M@0x6000000
+`mem=87M@0x0 ispmem=9M@0x5700000 rmem=32M@0x6000000`
 
 
-Check if its being applied using the following command:
+Check if the bootline has been applied properly using the following command:
 
+```$bash
 [root@DafangHacks:~]# cat /proc/cmdline
+```
 
-
-
-## My camera doesn't boot/I have failed flashing the bootloader - what now?
-You will need to desolder your chip, reflash it and solder it back.
-Here is information about how to do it:
-https://github.com/Dafang-Hacks/spiflasher
+## My camera doesn't boot/I have failed to flash the bootloader. What can I do now?
+You will need to desolder your bootrom, [reflash it](https://github.com/Dafang-Hacks/spiflasher) and solder it back.