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1a200ead4f
The rt-loader currently only supports booting piggy backed lzma compressed kernels. This requires a data layout where the kernel directly follows the loader. That might not be sufficient for more complex flash layouts. Especially bootbase devices (like ZyXEL GS1920) will need some kind of chain loading that needs to be explored yet. Enhance the rt-loader as follows: - Allow to build as standalone version - In this case a flash start address is given - During boot loader will search the ROM starting from that address - If it finds a uImage this will be loaded into RAM - Afterwards it will be decompressed to its load address - While we are here add uncompressed uImage support As always the implementation tries to be as simple as possible. - uImage detection works without magics - uImage will be loaded to highest possible memory address - Documentation in Makefile has been adapted accordingly Funny side fact: A standalone rt-loader can chain load a piggy backed rt-loader from flash. During bootup loader will show rt-loader Running on RTL8380M (chip id 6275C) with 256MB Relocate 15760 bytes from 0x82000000 to 0x8ffa0000 Searching for uImage starting at 0xb45a0000 ... uImage 'MIPS OpenWrt Linux-6.12.40' found at 0xb45a0000 with load address 0x80100000 Copy 2923034 bytes of image data to 0x8fcd61e6 ... Extract image with 2923034 bytes from 0x8fcd61e6 to 0x80100000 ... Final kernel size is 2923034 bytes Booting kernel from 0x80100000 ... Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de> Link: https://github.com/openwrt/openwrt/pull/19832 Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>