* Fix mdelay() on TRAB - this was still the debugging version with
seconds instead of ms. * Patch by Robert Schwebel, 1 Nov 2002: XScale related cleanup (affects all ARM boards) * Cleanup of names, warnings, and README.
This commit is contained in:
wdenk
parent
de180e6daa
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24ee89b97a
13
CHANGELOG
13
CHANGELOG
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@ -1,6 +1,17 @@
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======================================================================
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Changes since for U-Boot 0.1.0:
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======================================================================
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* Fix mdelay() on TRAB - this was still the debugging version with
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seconds instead of ms.
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* Patch by Robert Schwebel, 1 Nov 2002:
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XScale related cleanup (affects all ARM boards)
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* Cleanup of names and README.
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======================================================================
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Notes for U-Boot 1.0.0:
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Notes for U-Boot 0.1.0:
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======================================================================
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This is the initial version of "Das U-Boot", the Universal Boot Loader.
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140
README
140
README
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@ -24,13 +24,14 @@
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Summary:
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========
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This directory contains the source code for U-Boot, a monitor for
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Embedded PowerPC boards, which can be installed in a boot ROM and
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used to test the hardware or download and run application code.
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This directory contains the source code for U-Boot, a boot loader for
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Embedded boards based on PowerPC and ARM processors, which can be
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installed in a boot ROM and used to initialize and test the hardware
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or to download and run application code.
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The development of U-Boot is closely related to Linux: some parts of
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the source code originate in the Linux source tree, we still have
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some header files in common, and special provision has been made to
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the source code originate in the Linux source tree, we have some
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header files in common, and special provision has been made to
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support booting of Linux images.
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Some attention has been paid to make this software easily
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@ -45,23 +46,20 @@ Status:
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=======
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In general, all boards for which a configuration option exists in the
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Makefile have been tested to some extent and can be considered
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Makefile have been tested to some extent and can be considered
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"working". In fact, many of them are used in production systems.
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In case of problems see the CHANGELOG and CREDITS files to find out
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In case of problems see the CHANGELOG and CREDITS files to find out
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who contributed the specific port.
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Exception from this rule: the port to the Sandpoint 8240 has not been
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completed yet.
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Where to get help:
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==================
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In case you have questions about, problems with or contributions for
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U-Boot you should send a message to the U-Boot mailing list at
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<u-boot-users@lists.sourceforge.net>. There is also an archive of
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previous traffic on the mailing list - please search the archive
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In case you have questions about, problems with or contributions for
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U-Boot you should send a message to the U-Boot mailing list at
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<u-boot-users@lists.sourceforge.net>. There is also an archive of
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previous traffic on the mailing list - please search the archive
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before asking FAQ's. Please see
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http://lists.sourceforge.net/lists/listinfo/u-boot-users/
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@ -70,6 +68,7 @@ Where we come from:
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===================
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- start from 8xxrom sources
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- create PPCBoot project (http://sourceforge.net/projects/ppcboot)
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- clean up code
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- make it easier to add custom boards
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- make it possible to add other [PowerPC] CPUs
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@ -78,7 +77,31 @@ Where we come from:
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* S-Record download
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* network boot
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* PCMCIA / CompactFLash / ATA disk / SCSI ... boot
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- create ARMBoot project (http://sourceforge.net/projects/armboot)
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- add other CPU families (starting with ARM)
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- create U-Boot project (http://sourceforge.net/projects/u-boot)
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Names and Spelling:
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===================
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The "official" name of this project is "Das U-Boot". The spelling
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"U-Boot" shall be used in all written text (documentation, comments
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in source files etc.). Example:
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This is the README file for the U-Boot project.
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File names etc. shall be based on the string "u-boot". Examples:
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include/asm-ppc/u-boot.h
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#include <asm/u-boot.h>
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Variable names, preprocessor constants etc. shall be either based on
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the string "u_boot" or on "U_BOOT". Example:
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U_BOOT_VERSION u_boot_logo
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IH_OS_U_BOOT u_boot_hush_start
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Directory Hierarchy:
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@ -1675,7 +1698,7 @@ Note: for some board special configuration names may exist; check if
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Finally, type "make all", and you should get some working U-Boot
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Finally, type "make all", and you should get some working U-Boot
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images ready for downlod to / installation on your system:
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- "u-boot.bin" is a raw binary image
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@ -2013,28 +2036,55 @@ device (initial ramdisk, NFS) for your target system.
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Building a Linux Image:
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-----------------------
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No specific requirements for U-Boot. There is no need to add a
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"ramdisk.image.gz" file when building the kernel, even when you
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intend to run it with initial ramdisk.
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With U-Boot, "normal" build targets like "zImage" or "bzImage" are
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not used. If you use recent kernel source, a new build target
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"uImage" will exist which automatically builds an image usable by
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U-Boot. Most older kernels also have support for a "pImage" target,
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which was introduced for our predecessor project PPCBoot and uses a
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100% compatible format.
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Example:
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make TQM850L_config
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make oldconfig
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make dep
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make zImage
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make uImage
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However, we don't use the 'zImage' (= 'arch/ppc/mbxboot/zvmlinux') we
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build this way. The 'zImage' includes the old boot loader code which
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we don't ned any more. Instead, we use the raw (compressed) Linux
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kernel image in 'arch/ppc/coffboot/vmlinux.gz'.
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The "uImage" build target uses a special tool (in 'tools/mkimage') to
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encapsulate a compressed Linux kernel image with header information,
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CRC32 checksum etc. for use with U-Boot. This is what we are doing:
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There is a special tool (in 'tools/mkimage') to encapsulate this
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image with header information, CRC32 checksum etc. for use with
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U-Boot:
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* build a standard "vmlinux" kernel image (in ELF binary format):
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In the first form (with "-l" option) mkimage lists the information
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contained in the header of an existing U-Boot image; this includes
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* convert the kernel into a raw binary image:
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${CROSS_COMPILE}-objcopy -O binary \
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-R .note -R .comment \
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-S vmlinux linux.bin
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* compress the binary image:
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gzip -9 linux.bin
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* package compressed binary image for U-Boot:
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mkimage -A ppc -O linux -T kernel -C gzip \
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-a 0 -e 0 -n "Linux Kernel Image" \
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-d linux.bin.gz uImage
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The "mkimage" tool can also be used to create ramdisk images for use
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with U-Boot, either separated from the Linux kernel image, or
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combined into one file. "mkimage" encapsulates the images with a 64
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byte header containing information about target architecture,
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operating system, image type, compression method, entry points, time
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stamp, CRC32 checksums, etc.
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"mkimage" can be called in two ways: to verify existing images and
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print the header information, or to build new images.
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In the first form (with "-l" option) mkimage lists the information
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contained in the header of an existing U-Boot image; this includes
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checksum verification:
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tools/mkimage -l image
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@ -2058,47 +2108,47 @@ Right now, all Linux kernels use the same load address (0x00000000),
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but the entry point address depends on the kernel version:
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- 2.2.x kernels have the entry point at 0x0000000C,
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- 2.3.x and 2.4.x kernels have the entry point at 0x00000000.
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- 2.3.x and later kernels have the entry point at 0x00000000.
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So a typical call to build a U-Boot image would read:
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-> tools/mkimage -n '2.2.13 for initrd on TQM850L' \
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> -A ppc -O linux -T kernel -C gzip -a 00000000 -e 0000000C \
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> -d /opt/mpc8xx/src/linux-2.2.13/arch/ppc/coffboot/vmlinux.gz \
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> examples/image-2.2.13-initrd
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Image Name: 2.2.13 for initrd on TQM850L
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-> tools/mkimage -n '2.4.4 kernel for TQM850L' \
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> -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \
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> -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/ppc/coffboot/vmlinux.gz \
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> examples/uImage.TQM850L
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Image Name: 2.4.4 kernel for TQM850L
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Created: Wed Jul 19 02:34:59 2000
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Image Type: PowerPC Linux Kernel Image (gzip compressed)
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Data Size: 335725 Bytes = 327.86 kB = 0.32 MB
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Load Address: 0x00000000
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Entry Point: 0x0000000c
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Entry Point: 0x00000000
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To verify the contents of the image (or check for corruption):
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-> tools/mkimage -l examples/image-2.2.13-initrd
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Image Name: 2.2.13 for initrd on TQM850L
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-> tools/mkimage -l examples/uImage.TQM850L
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Image Name: 2.4.4 kernel for TQM850L
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Created: Wed Jul 19 02:34:59 2000
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Image Type: PowerPC Linux Kernel Image (gzip compressed)
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Data Size: 335725 Bytes = 327.86 kB = 0.32 MB
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Load Address: 0x00000000
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Entry Point: 0x0000000c
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Entry Point: 0x00000000
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NOTE: for embedded systems where boot time is critical you can trade
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speed for memory and install an UNCOMPRESSED image instead: this
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needs more space in Flash, but boots much faster since it does not
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need to be uncompressed:
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-> gunzip /opt/mpc8xx/src/linux-2.2.13/arch/ppc/coffboot/vmlinux.gz
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-> tools/mkimage -n '2.2.13 for initrd on TQM850L' \
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> -A ppc -O linux -T kernel -C none -a 00000000 -e 0000000C \
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> -d /opt/mpc8xx/src/linux-2.2.13/arch/ppc/coffboot/vmlinux \
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> examples/image-2.2.13-initrd-uncompressed
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Image Name: 2.2.13 for initrd on TQM850L
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-> gunzip /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/ppc/coffboot/vmlinux.gz
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-> tools/mkimage -n '2.4.4 kernel for TQM850L' \
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> -A ppc -O linux -T kernel -C none -a 0 -e 0 \
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> -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/ppc/coffboot/vmlinux \
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> examples/uImage.TQM850L-uncompressed
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Image Name: 2.4.4 kernel for TQM850L
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Created: Wed Jul 19 02:34:59 2000
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Image Type: PowerPC Linux Kernel Image (uncompressed)
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Data Size: 792160 Bytes = 773.59 kB = 0.76 MB
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Load Address: 0x00000000
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Entry Point: 0x0000000c
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Entry Point: 0x00000000
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Similar you can build U-Boot images from a 'ramdisk.image.gz' file
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/* so we do _nothing_ here */
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/* arch number of CSB226 board */
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gd->bd->bi_arch_number = 0; /* FIXME */
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gd->bd->bi_arch_number = 216;
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/* adress of boot parameters */
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gd->bd->bi_boot_params = 0xa0000100;
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ldr r4, =0x03ca4fff
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str r4, [r1, #MDREFR_OFFSET] /* write back MDREFR */
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ldr r4, [r1, #MDREFR_OFFSET]
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ldr r4, [r1, #MDREFR_OFFSET]
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ldr r4, =0x03ca4030
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str r4, [r1, #MDREFR_OFFSET] /* write back MDREFR */
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@ -261,7 +261,7 @@ mem_init:
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/* Step 4a: assert MDREFR:K1RUN and MDREFR:K2RUN and configure */
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/* MDREFR:K1DB2 and MDREFR:K2DB2 as desired. */
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orr r4, r4, #(MDREFR_K1RUN|MDREFR_K2RUN|MDREFR_K0RUN)
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orr r4, r4, #(MDREFR_K1RUN|MDREFR_K0RUN)
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str r4, [r1, #MDREFR_OFFSET] /* write back MDREFR */
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ldr r4, [r1, #MDREFR_OFFSET]
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@ -286,7 +286,7 @@ mem_init:
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/* Step 4d: write MDCNFG with MDCNFG:DEx deasserted (set to 0), to */
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/* configure but not enable each SDRAM partition pair. */
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ldr r4, [r1, #MDCNFG_OFFSET]
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ldr r4, =CFG_MDCNFG_VAL
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bic r4, r4, #(MDCNFG_DE0|MDCNFG_DE1)
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str r4, [r1, #MDCNFG_OFFSET] /* write back MDCNFG */
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@ -42,7 +42,7 @@ extern int do_mdm_init; /* defined in common/main.c */
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* is that timers are not available yet, so we use a manually timed
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* loop.
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*/
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#define KBD_MDELAY 100000 /* 1000 */
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#define KBD_MDELAY 1000
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static void mdelay_no_timer (int msec)
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{
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DECLARE_GLOBAL_DATA_PTR;
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