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diff --git a/doc/uImage.FIT/howto.txt b/doc/uImage.FIT/howto.txt new file mode 100644 index 0000000..8065e9e --- /dev/null +++ b/doc/uImage.FIT/howto.txt @@ -0,0 +1,297 @@ +How to use images in the new image format +========================================= + +Author: Bartlomiej Sieka <tur@semihalf.com> + + +Overview +-------- + +The new uImage format allows more flexibility in handling images of various +types (kernel, ramdisk, etc.), it also enhances integrity protection of images +with sha1 and md5 checksums. + +Two auxiliary tools are needed on the development host system in order to +create an uImage in the new format: mkimage and dtc, although only one +(mkimage) is invoked directly. dtc is called from within mkimage and operates +behind the scenes, but needs to be present in the $PATH nevertheless. It is +important that the dtc used has support for binary includes -- refer to +www.jdl.com for its latest version. mkimage (together with dtc) takes as input +an image source file, which describes the contents of the image and defines +its various properties used during booting. By convention, image source file +has the ".its" extension, also, the details of its format are given in +doc/source_file_format.txt. The actual data that is to be included in the +uImage (kernel, ramdisk, etc.) is specified in the image source file in the +form of paths to appropriate data files. The outcome of the image creation +process is a binary file (by convention with the ".itb" extension) that +contains all the referenced data (kernel, ramdisk, etc.) and other information +needed by U-Boot to handle the uImage properly. The uImage file is then +transferred to the target (e.g., via tftp) and booted using the bootm command. + +To summarize the prerequisites needed for new uImage creation: +- mkimage +- dtc (with support for binary includes) +- image source file (*.its) +- image data file(s) + + +Here's a graphical overview of the image creation and booting process: + +image source file mkimage + dtc transfer to target + + ---------------> image file --------------------> bootm +image data files(s) + + +Example 1 -- old-style (non-FDT) kernel booting +----------------------------------------------- + +Consider a simple scenario, where a PPC Linux kernel built from sources on the +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 +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 +DTC: dts->dtb on file "kernel.its" +$ +$ mkimage -l kernel.itb +FIT description: Simple image with single Linux kernel +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 + Architecture: PowerPC + OS: Linux + Load Address: 0x00000000 + 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 + + +The resulting image file kernel.itb can be now transferred to the target, +inspected and booted (note that first three U-Boot commands below are shown +for completeness -- they are part of the standard booting procedure and not +specific to the new image format). + +[on the target system] +=> print nfsargs +nfsargs=setenv bootargs root=/dev/nfs rw nfsroot=${serverip}:${rootpath} +=> print addip +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 +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 +Loading: ################################################################# +done +Bytes transferred = 944464 (e6950 hex) +=> iminfo + +## Checking Image at 00900000 ... + FIT image found + FIT description: Simple image with single Linux kernel + Created: 2008-03-11 16:26:15 UTC + Image 0 (kernel@1) + Description: Vanilla Linux kernel + Type: Kernel Image + Compression: gzip compressed + Data Start: 0x009000e0 + Data Size: 943347 Bytes = 921.2 kB + Architecture: PowerPC + OS: Linux + Load Address: 0x00000000 + 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 + +=> bootm +## Booting kernel from FIT Image at 00900000 ... + Using 'config@1' configuration + Trying 'kernel@1' kernel subimage + Description: Vanilla Linux kernel + Type: Kernel Image + Compression: gzip compressed + Data Start: 0x009000e0 + Data Size: 943347 Bytes = 921.2 kB + Architecture: PowerPC + OS: Linux + Load Address: 0x00000000 + Entry Point: 0x00000000 + Hash algo: crc32 + Hash value: 2ae2bb40 + Hash algo: sha1 + Hash value: 3c200f34e2c226ddc789240cca0c59fc54a67cf4 + Verifying Hash Integrity ... crc32+ sha1+ OK + Uncompressing Kernel Image ... OK +Memory BAT mapping: BAT2=256Mb, BAT3=0Mb, residual: 0Mb +Linux version 2.4.25 (m8@hekate) (gcc version 4.0.0 (DENX ELDK 4.0 4.0.0)) #2 czw lip 5 17:56:18 CEST 2007 +On node 0 totalpages: 65536 +zone(0): 65536 pages. +zone(1): 0 pages. +zone(2): 0 pages. +Kernel command line: root=/dev/nfs rw nfsroot=192.168.1.1:/opt/eldk-4.1/ppc_6xx ip=192.168.160.5:192.168.1.1::255.255.0.0:lite5200b:eth0:off panic=1 +Calibrating delay loop... 307.20 BogoMIPS + + +Example 2 -- new-style (FDT) kernel booting +------------------------------------------- + +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 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 +DTC: dts->dtb on file "kernel_fdt.its" +$ +$ mkimage -l kernel_fdt.itb +FIT description: Simple image with single Linux kernel and FDT blob +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 + Architecture: PowerPC + OS: Linux + Load Address: 0x00000000 + 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 + Architecture: PowerPC + 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 + + +The resulting image file kernel_fdt.itb can be now transferred to the target, +inspected and booted: + +[on the target system] +=> tftp 900000 /path/to/tftp/location/kernel_fdt.itb +Using FEC ETHERNET 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 + Image 0 (kernel@1) + Description: Vanilla Linux kernel + Type: Kernel Image + Compression: gzip compressed + Data Start: 0x009000ec + Data Size: 1092037 Bytes = 1 MB + Architecture: PowerPC + OS: Linux + Load Address: 0x00000000 + 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 Start: 0x00a0abdc + Data Size: 16384 Bytes = 16 kB + Architecture: PowerPC + 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 +=> bootm +## Booting kernel from FIT Image at 00900000 ... + Using 'conf@1' configuration + Trying 'kernel@1' kernel subimage + Description: Vanilla Linux kernel + Type: Kernel Image + Compression: gzip compressed + Data Start: 0x009000ec + Data Size: 1092037 Bytes = 1 MB + Architecture: PowerPC + OS: Linux + Load Address: 0x00000000 + Entry Point: 0x00000000 + Hash algo: crc32 + Hash value: 2c0cc807 + Hash algo: sha1 + Hash value: 264b59935470e42c418744f83935d44cdf59a3bb + Verifying Hash Integrity ... crc32+ sha1+ OK + Uncompressing Kernel Image ... OK +## Flattened Device Tree from FIT Image at 00900000 + Using 'conf@1' configuration + Trying 'fdt@1' FDT blob subimage + Description: Flattened Device Tree blob + Type: Flat Device Tree + Compression: uncompressed + Data Start: 0x00a0abdc + Data Size: 16384 Bytes = 16 kB + Architecture: PowerPC + Hash algo: crc32 + Hash value: 0d655d71 + Hash algo: sha1 + Hash value: 25ab4e15cd4b8a5144610394560d9c318ce52def + Verifying Hash Integrity ... crc32+ sha1+ OK + Booting using the fdt blob at 0xa0abdc + Loading Device Tree to 007fc000, end 007fffff ... OK +[ 0.000000] Using lite5200 machine description +[ 0.000000] Linux version 2.6.24-rc6-gaebecdfc (m8@hekate) (gcc version 4.0.0 (DENX ELDK 4.1 4.0.0)) #1 Sat Jan 12 15:38:48 CET 2008 + + +Example 3 -- advanced booting +----------------------------- + +Refer to doc/uImage.FIT/multi.its for an image source file that allows more +sophisticated booting scenarios (multiple kernels, ramdisks and fdt blobs). |