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doc: booting with U-Boot from SD card

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Adam Mizerski 2020-12-04 22:25:14 +01:00
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documentation.txt
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@ -28,7 +28,7 @@ the NAND or bootloader happens.
Use cases Use cases
~~~~~~~~ ~~~~~~~~~
In fact, most users do not need it. Either way, possible use cases: In fact, most users do not need it. Either way, possible use cases:
-Changing typos in bootscripts which prevent an operation system -Changing typos in bootscripts which prevent an operation system
@ -48,8 +48,9 @@ In fact, most users do not need it. Either way, possible use cases:
-and more... -and more...
Booting rescueOS
~~~~~~~~~~~~~~~ Booting rescueOS with flasher
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Note: You can not store persistent data in /. Of Note: You can not store persistent data in /. Of
course, it becomes possible on the mount points you mount the EMMC or sd card course, it becomes possible on the mount points you mount the EMMC or sd card
to. to.
@ -93,6 +94,34 @@ should block and wait. Now connect the N900 to the PC with the data cable; the
flasher should detect the device, upload rescueOS, launch it, and then exit. flasher should detect the device, upload rescueOS, launch it, and then exit.
Booting rescueOS with U-Boot from SD card
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Use this method if you have installed U-Boot (https://talk.maemo.org/showthread.php?t=81613)
and battery is so depleted, that flashing doesn't work.
You'll need "mkimage" command from "u-boot-tools" package.
Preparing required files:
mkimage -A arm -O linux -T kernel -C none -a 80008000 -e 80008000 -n kernel -d rescueOS_n900_kernel_1.3.zImage rescueOS_n900_kernel_1.3.uImage
mkimage -A arm -O linux -T ramdisk -C none -a 0 -e 0 -n initrd -d rescueOS-1.3.img rescueOS-1.3.uimg
cat >boot.cmd <<EOF
setenv bootargs rootdelay root=/dev/ram0;
setenv setup_omap_atag 1;
setenv mmckernfile rescueOS_n900_kernel_1.3.uImage;
setenv mmcinitrdfile rescueOS-1.3.uimg;
setenv mmcscriptfile;
run trymmckerninitrdboot;
EOF
mkimage -c none -A arm -T script -d boot.cmd boot.scr
Preparing SD card:
Your SD card needs to have the first partition formatted as ext2/3/4 or FAT.
Put generated files (without boot.cmd) in the root directory.
Now you should be able to boot rescueOS with generic "External SD card" option from U-Boot.
~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~
How to use it How to use it
~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~
@ -115,7 +144,7 @@ code_reset
# This will set the lock code back to the default ('12345'). # This will set the lock code back to the default ('12345').
USB Networking USB Networking
------------- --------------
/rescueOS/usbnetworking-enable.sh /rescueOS/usbnetworking-enable.sh
Sets up USB networking in the following way: Sets up USB networking in the following way:
ifconfig usb0 192.168.2.15 up ifconfig usb0 192.168.2.15 up