This allows splitting EVA images (usually found in fritz devices). The firmware will be split into a kernel and a separate rootfs partition. Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com> SVN-Revision: 48262master
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/*
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* Copyright (C) 2012 John Crispin <blogic@openwrt.org> |
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* Copyright (C) 2015 Martin Blumenstingl <martin.blumenstingl@googlemail.com> |
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* |
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* This program is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 as published |
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* by the Free Software Foundation. |
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* |
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*/ |
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/kernel.h> |
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#include <linux/slab.h> |
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#include <linux/mtd/mtd.h> |
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#include <linux/mtd/partitions.h> |
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#include <linux/byteorder/generic.h> |
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#include "mtdsplit.h" |
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#define EVA_NR_PARTS 2 |
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#define EVA_MAGIC 0xfeed1281 |
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#define EVA_FOOTER_SIZE 0x18 |
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#define EVA_DUMMY_SQUASHFS_SIZE 0x100 |
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struct eva_image_header { |
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uint32_t magic; |
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uint32_t size; |
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}; |
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static int mtdsplit_parse_eva(struct mtd_info *master, |
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struct mtd_partition **pparts, |
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struct mtd_part_parser_data *data) |
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{ |
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struct mtd_partition *parts; |
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struct eva_image_header hdr; |
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size_t retlen; |
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unsigned long kernel_size, rootfs_offset; |
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int err; |
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err = mtd_read(master, 0, sizeof(hdr), &retlen, (void *) &hdr); |
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if (err) |
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return err; |
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if (retlen != sizeof(hdr)) |
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return -EIO; |
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if (le32_to_cpu(hdr.magic) != EVA_MAGIC) |
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return -EINVAL; |
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kernel_size = le32_to_cpu(hdr.size) + EVA_FOOTER_SIZE; |
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/* rootfs starts at the next 0x10000 boundary: */ |
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rootfs_offset = round_up(kernel_size, 0x10000); |
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/* skip the dummy EVA squashfs partition (with wrong endianness): */ |
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rootfs_offset += EVA_DUMMY_SQUASHFS_SIZE; |
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if (rootfs_offset >= master->size) |
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return -EINVAL; |
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err = mtd_check_rootfs_magic(master, rootfs_offset); |
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if (err) |
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return err; |
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parts = kzalloc(EVA_NR_PARTS * sizeof(*parts), GFP_KERNEL); |
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if (!parts) |
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return -ENOMEM; |
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parts[0].name = KERNEL_PART_NAME; |
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parts[0].offset = 0; |
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parts[0].size = kernel_size; |
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parts[1].name = ROOTFS_PART_NAME; |
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parts[1].offset = rootfs_offset; |
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parts[1].size = master->size - rootfs_offset; |
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*pparts = parts; |
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return EVA_NR_PARTS; |
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} |
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static struct mtd_part_parser mtdsplit_eva_parser = { |
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.owner = THIS_MODULE, |
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.name = "eva-fw", |
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.parse_fn = mtdsplit_parse_eva, |
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.type = MTD_PARSER_TYPE_FIRMWARE, |
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}; |
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static int __init mtdsplit_eva_init(void) |
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{ |
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register_mtd_parser(&mtdsplit_eva_parser); |
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return 0; |
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} |
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subsys_initcall(mtdsplit_eva_init); |
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