Here's a graphical overview of the image creation and booting process:
-image source file mkimage + dtc transfer to target
- + ---------------> image file --------------------> bootm
+image source file mkimage + dtc transfer to target
+ + ---------------> image file --------------------> bootm
image data files(s)
development host is to be booted old-style (non-FDT) by U-Boot on an embedded
target. Assume that the outcome of the build is vmlinux.bin.gz, a file which
contains a gzip-compressed PPC Linux kernel (the only data file in this case).
-The uImage can be produced using the image source file examples/kernel.its
-(note that kernel.its assumes that vmlinux.bin.gz is in the current working
-directory; if desired, an alternative path can be specified in the kernel.its
-file). Here's how to create the image and inspect its contents:
+The uImage can be produced using the image source file
+doc/uImage.FIT/kernel.its (note that kernel.its assumes that vmlinux.bin.gz is
+in the current working directory; if desired, an alternative path can be
+specified in the kernel.its file). Here's how to create the image and inspect
+its contents:
[on the host system]
$ mkimage -f kernel.its kernel.itb
$
$ mkimage -l kernel.itb
FIT description: Simple image with single Linux kernel
-Created: Tue Mar 11 17:26:15 2008
+Created: Tue Mar 11 17:26:15 2008
Image 0 (kernel@1)
- Description: Vanilla Linux kernel
- Type: Kernel Image
- Compression: gzip compressed
- Data Size: 943347 Bytes = 921.24 kB = 0.90 MB
+ Description: Vanilla Linux kernel
+ Type: Kernel Image
+ Compression: gzip compressed
+ Data Size: 943347 Bytes = 921.24 kB = 0.90 MB
Architecture: PowerPC
- OS: Linux
+ OS: Linux
Load Address: 0x00000000
- Entry Point: 0x00000000
- Hash algo: crc32
- Hash value: 2ae2bb40
- Hash algo: sha1
- Hash value: 3c200f34e2c226ddc789240cca0c59fc54a67cf4
+ Entry Point: 0x00000000
+ Hash algo: crc32
+ Hash value: 2ae2bb40
+ Hash algo: sha1
+ Hash value: 3c200f34e2c226ddc789240cca0c59fc54a67cf4
Default Configuration: 'config@1'
Configuration 0 (config@1)
- Description: Boot Linux kernel
- Kernel: kernel@1
+ Description: Boot Linux kernel
+ Kernel: kernel@1
The resulting image file kernel.itb can be now transferred to the target,
addip=setenv bootargs ${bootargs} ip=${ipaddr}:${serverip}:${gatewayip}:${netmask}:${hostname}:${netdev}:off panic=1
=> run nfsargs addip
=> tftp 900000 /path/to/tftp/location/kernel.itb
-Using FEC ETHERNET device
+Using FEC device
TFTP from server 192.168.1.1; our IP address is 192.168.160.5
Filename '/path/to/tftp/location/kernel.itb'.
Load address: 0x900000
## Checking Image at 00900000 ...
FIT image found
FIT description: Simple image with single Linux kernel
- Created: 2008-03-11 16:26:15 UTC
+ Created: 2008-03-11 16:26:15 UTC
Image 0 (kernel@1)
Description: Vanilla Linux kernel
- Type: Kernel Image
+ Type: Kernel Image
Compression: gzip compressed
Data Start: 0x009000e0
Data Size: 943347 Bytes = 921.2 kB
Architecture: PowerPC
- OS: Linux
+ OS: Linux
Load Address: 0x00000000
Entry Point: 0x00000000
Hash algo: crc32
Default Configuration: 'config@1'
Configuration 0 (config@1)
Description: Boot Linux kernel
- Kernel: kernel@1
+ Kernel: kernel@1
=> bootm
## Booting kernel from FIT Image at 00900000 ...
Using 'config@1' configuration
Trying 'kernel@1' kernel subimage
Description: Vanilla Linux kernel
- Type: Kernel Image
+ Type: Kernel Image
Compression: gzip compressed
Data Start: 0x009000e0
Data Size: 943347 Bytes = 921.2 kB
Architecture: PowerPC
- OS: Linux
+ OS: Linux
Load Address: 0x00000000
Entry Point: 0x00000000
Hash algo: crc32
Consider another simple scenario, where a PPC Linux kernel is to be booted
new-style, i.e., with a FDT blob. In this case there are two prerequisite data
files: vmlinux.bin.gz (Linux kernel) and target.dtb (FDT blob). The uImage can
-be produced using image source file examples/kernel_fdt.its like this (note
-again, that both prerequisite data files are assumed to be present in the
-current working directory -- image source file kernel_fdt.its can be modified
-to take the files from some other location if needed):
+be produced using image source file doc/uImage.FIT/kernel_fdt.its like this
+(note again, that both prerequisite data files are assumed to be present in
+the current working directory -- image source file kernel_fdt.its can be
+modified to take the files from some other location if needed):
[on the host system]
$ mkimage -f kernel_fdt.its kernel_fdt.itb
$
$ mkimage -l kernel_fdt.itb
FIT description: Simple image with single Linux kernel and FDT blob
-Created: Tue Mar 11 16:29:22 2008
+Created: Tue Mar 11 16:29:22 2008
Image 0 (kernel@1)
- Description: Vanilla Linux kernel
- Type: Kernel Image
- Compression: gzip compressed
- Data Size: 1092037 Bytes = 1066.44 kB = 1.04 MB
+ Description: Vanilla Linux kernel
+ Type: Kernel Image
+ Compression: gzip compressed
+ Data Size: 1092037 Bytes = 1066.44 kB = 1.04 MB
Architecture: PowerPC
- OS: Linux
+ OS: Linux
Load Address: 0x00000000
- Entry Point: 0x00000000
- Hash algo: crc32
- Hash value: 2c0cc807
- Hash algo: sha1
- Hash value: 264b59935470e42c418744f83935d44cdf59a3bb
+ Entry Point: 0x00000000
+ Hash algo: crc32
+ Hash value: 2c0cc807
+ Hash algo: sha1
+ Hash value: 264b59935470e42c418744f83935d44cdf59a3bb
Image 1 (fdt@1)
- Description: Flattened Device Tree blob
- Type: Flat Device Tree
- Compression: uncompressed
- Data Size: 16384 Bytes = 16.00 kB = 0.02 MB
+ Description: Flattened Device Tree blob
+ Type: Flat Device Tree
+ Compression: uncompressed
+ Data Size: 16384 Bytes = 16.00 kB = 0.02 MB
Architecture: PowerPC
- Hash algo: crc32
- Hash value: 0d655d71
- Hash algo: sha1
- Hash value: 25ab4e15cd4b8a5144610394560d9c318ce52def
+ Hash algo: crc32
+ Hash value: 0d655d71
+ Hash algo: sha1
+ Hash value: 25ab4e15cd4b8a5144610394560d9c318ce52def
Default Configuration: 'conf@1'
Configuration 0 (conf@1)
- Description: Boot Linux kernel with FDT blob
- Kernel: kernel@1
- FDT: fdt@1
+ Description: Boot Linux kernel with FDT blob
+ Kernel: kernel@1
+ FDT: fdt@1
The resulting image file kernel_fdt.itb can be now transferred to the target,
[on the target system]
=> tftp 900000 /path/to/tftp/location/kernel_fdt.itb
-Using FEC ETHERNET device
+Using FEC device
TFTP from server 192.168.1.1; our IP address is 192.168.160.5
Filename '/path/to/tftp/location/kernel_fdt.itb'.
Load address: 0x900000
Loading: #################################################################
- ###########
+ ###########
done
Bytes transferred = 1109776 (10ef10 hex)
=> iminfo
## Checking Image at 00900000 ...
FIT image found
FIT description: Simple image with single Linux kernel and FDT blob
- Created: 2008-03-11 15:29:22 UTC
+ Created: 2008-03-11 15:29:22 UTC
Image 0 (kernel@1)
Description: Vanilla Linux kernel
- Type: Kernel Image
+ Type: Kernel Image
Compression: gzip compressed
Data Start: 0x009000ec
Data Size: 1092037 Bytes = 1 MB
Architecture: PowerPC
- OS: Linux
+ OS: Linux
Load Address: 0x00000000
Entry Point: 0x00000000
Hash algo: crc32
Hash value: 264b59935470e42c418744f83935d44cdf59a3bb
Image 1 (fdt@1)
Description: Flattened Device Tree blob
- Type: Flat Device Tree
+ Type: Flat Device Tree
Compression: uncompressed
Data Start: 0x00a0abdc
Data Size: 16384 Bytes = 16 kB
Default Configuration: 'conf@1'
Configuration 0 (conf@1)
Description: Boot Linux kernel with FDT blob
- Kernel: kernel@1
- FDT: fdt@1
+ Kernel: kernel@1
+ FDT: fdt@1
=> bootm
## Booting kernel from FIT Image at 00900000 ...
Using 'conf@1' configuration
Trying 'kernel@1' kernel subimage
Description: Vanilla Linux kernel
- Type: Kernel Image
+ Type: Kernel Image
Compression: gzip compressed
Data Start: 0x009000ec
Data Size: 1092037 Bytes = 1 MB
Architecture: PowerPC
- OS: Linux
+ OS: Linux
Load Address: 0x00000000
Entry Point: 0x00000000
Hash algo: crc32
Using 'conf@1' configuration
Trying 'fdt@1' FDT blob subimage
Description: Flattened Device Tree blob
- Type: Flat Device Tree
+ Type: Flat Device Tree
Compression: uncompressed
Data Start: 0x00a0abdc
Data Size: 16384 Bytes = 16 kB
Example 3 -- advanced booting
-----------------------------
-Refer to examples/multi.its for an image source file that allows more
+Refer to doc/uImage.FIT/multi.its for an image source file that allows more
sophisticated booting scenarios (multiple kernels, ramdisks and fdt blobs).
projects / u-boot / blobdiff