The way that kernel/boot/initrd system work on PC (i386/x86_64) are different from Fedora-Arm. I am determining and experimenting of these pieces and figuring out how it replaces, adapts, or reuses and how it implements on Fedora-Arm bases. For more details, please look at this link: More details.
I got my Fedora-Arm board and I connected to my laptop. In order to get terminal from serial port and interact with this, I installed minicom with this command: yum install minicom
Here is a quick way to set up your minicom:
- Enter this command: minicom -s
- Go to: Serial port setup
- Change Serial device to "/dev/ttyUSB0
- Change Hardware Flow Control to No
- Select Save setup as dfl
- mmc init ---->to make SD card available
- fatload mmc 0 0x80300000 uImage.bin ------> to load kernel to memory
- setenv bootargs console=ttyS2,115200n8 noinitrd root=/dev/mmcblk0p1 rw rootdelay=1 ----> to set some environment variables.
- boots 0x80300000 ----> to boot kernel from memory
Waiting 1sec before mounting root device...
mmc0: new high speed SD card at address b368
mmcblk0: mmc0:b368 5 3.83 GiB
VFS: Cannot open root device "b302" or unknown-block(179,2)
Please append a correct "root=" boot option; here are the available partitions:
1f00 512 mtdblock0 (driver?)
1f01 1920 mtdblock1 (driver?)
1f02 128 mtdblock2 (driver?)
1f03 4096 mtdblock3 (driver?)
1f04 255488 mtdblock4 (driver?)
b300 4020224 mmcblk0 driver: mmcblk
b301 4016128 mmcblk0p1
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(179,2)
To solve this error, I emailed to my friends in Fedora Arm list and I got lot's of feedback and opinions. Finally, the problem solved by changing " root=/dev/mmcblk0p1" in environment variable to "/root=b301". As the output of error showed, I should call the partition with the hexadecimal code "b301" since it does not know about device at this moment.
So, the problem solved. Next step is init and initrd that I am working on that now. I will post a new page about init and initrd very soon and I will explain what I found and what was my struggling to run initrd.