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authorRoman Yeryomin <roman@advem.lv>2013-08-16 11:44:04 +0300
committerRoman Yeryomin <roman@advem.lv>2013-08-16 11:44:04 +0300
commitdee99ab0143122146ab7713cfe171790bc796dd3 (patch)
tree907ad856f6ceae17a70dd1df004a1adee8a1b2fd /target/linux/realtek/files/rtkload/README
parent4ed5985ada0f0420d69d7d959ecc3c9c8515efa0 (diff)
Get rid of rtkload. Use OpenWrt lzma-loader (with kernel_entry hack). Use mgbin for unified tftp image generation.
Signed-off-by: Roman Yeryomin <roman@advem.lv>
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-hfload is a simple, second stage ELF bootloader for the VTech Helio.
-It is probably generalizable to other Philips R3912 devices with a
-friendly boot rom and flash.
-
-It works on both real Helio hardware and the Helio emulator.
-
-LEGAL STUFF
-===========
-
-This software is subject to the terms and conditions of the GNU
-General Public License. See the file "COPYING" in the main directory
-of this archive for more details.
-
-Copyright (C) 2000 by Jay Carlson.
-
-Many files originated in the Linux kernel.
-
-Note that my intent is that the last two stages of the build process
-(production of the ELF memory image, and conversion to a raw ROM
-image) are "mere aggregation [...] on a volume of a storage or
-distribution medium" in the sense of the last paragraph of section 2
-of the GPL. If necessary, I will arrange that the aggregation
-mechanism is "/bin/cat" or a simple C program, if anyone has a problem
-with my use of a "linker" to throw together files in a single box. No
-real linking is done at this stage; the Linux kernel is treated as
-pure data.
-
-QUICK START
-===========
-
-Point the Makefile at your kernel build directory. If building for
-the emulator, uncomment the EMULATOR line in the Makefile.
-
-If you don't have a romdisk image, touch romdisk.
-
-Put the first 64K of a 2M VT-OS rom image in "vtboot"; if you're
-building for the real hardware you can fake it with "make fake-vtboot".
-
-"make" produces "tryrom" and "linux.bin". tryrom is a full 2M ROM
-image for the emulator containing the VTOS bootloader, hfload, a
-compressed stripped copy of your vmlinux, and the contents of romdisk.
-linux.bin is a 2M-128k OS upgrade image without the VTOS bootloader,
-suitable for use with the VTech "dt.exe" flash programming tool.
-
-WHAT IT DOES
-============
-
-On startup, the VT-OS bootroom sets up the hardware a little, installs
-a 4k stack, and jumps to 0x9fc10000 in ROM. hfload begins here.
-
-Setup
------
-
-start.S zeroes the hfload bss area. It moves the stack to somewhere
-more spacious (paranoia), and jumps to main(). (It should turn on the
-serial port too.)
-
-main() immediately prints a message on serial port A. (It used to try
-to initialize the Helio LCD hardware, but that's commented out now.)
-
-Decompression
--------------
-
-The contents of the input_data-input_data_end region are gunzip'd from
-flash to the 4M mark in memory, at the start of the second DRAM bank.
-
-input_data typically points to a gzip'd stripped Linux kernel.
-
-ELF load
---------
-
-main() reads in the ELF header from the decompressed data.
-(Currently, the only error checking is verification that the declared
-sizes of structures match the expected sizes; this catches most
-errors.) The ELF image is copied to its destinations declared in the
-program headers, and excess memory is properly zeroed.
-
-Kernel start
-------------
-
-main() hands the ELF entry address to start.S:start_kernel.
-start_kernel places the address of the romdisk area at 0x80030000,
-restores the stack, and calls entry_address(0,0,0).
-
-WHY THE IMAGE READ FUNCTIONS ARE SO UGLY
-========================================
-
-I originally debugged this application as a userland binary, reading
-the image from a file descriptor. I then realized I could mmap() the
-kernel image. The restrictions on read_struct, copy_to_region, and
-seek_forward came out of this. As it turns out, the "can only seek
-forward, must be aligned" characteristics may be useful in the future.
-There's no reason why the entire kernel has to be uncompressed as a
-big blob; the stream reading functions could be rewritten to process
-the 32k decompressed windows as a coroutine to the decompression
-process. ELF images over about 2M are going to need this.
-
-WHY THIS WHOLE APP IS SO UGLY
-=============================
-
-Most of this will be rewritten once I understand better what I'm
-trying to do. Why make throwaway code pretty?
-
-VTBOOT
-======
-
-The file "vtboot" is not included with this distribution. It is an
-image of the VTech VT-OS bootloader that's hardwired into real Helio
-devices. It's the first 64k of a full VT-OS rom image. Given such a
-rom image, it can be extracted by:
-
- dd if=VTOS-1-1-03.rom of=vtboot bs=64k count=1
-
-If you're building for the real hardware, you don't need this file.
-"make fake-vtboot" produces 64k of zeroes.