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https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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662c0002ca
The bootloader used on the Realtek RTL9302C boards is an ancient vendor fork of U-Boot that doesn't understand device trees. So to run a modern kernel it is necessary use one of the APPENDED_DTB options. When appending the DTB the inintrd information, if present, needs to be inserted into the /chosen device tree node. The bootloader provides the initrd start/size via the firmware environment. Add a fdt fixup that will update the device tree with the initrd information. Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
80 lines
1.6 KiB
C
80 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2024 Allied Telesis
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*/
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#include <linux/errno.h>
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#include <linux/libfdt.h>
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#include <linux/printk.h>
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#include <linux/types.h>
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#include <asm/fw/fw.h>
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#include <asm/machine.h>
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static __init int realtek_add_initrd(void *fdt)
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{
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int node, err;
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u32 start, size;
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node = fdt_path_offset(fdt, "/chosen");
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if (node < 0) {
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pr_err("/chosen node not found\n");
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return -ENOENT;
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}
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start = fw_getenvl("initrd_start");
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size = fw_getenvl("initrd_size");
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if (start == 0 && size == 0)
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return 0;
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pr_info("Adding initrd info from environment\n");
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err = fdt_setprop_u32(fdt, node, "linux,initrd-start", start);
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if (err) {
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pr_err("unable to set initrd-start: %d\n", err);
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return err;
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}
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err = fdt_setprop_u32(fdt, node, "linux,initrd-end", start + size);
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if (err) {
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pr_err("unable to set initrd-end: %d\n", err);
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return err;
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}
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return 0;
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}
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static const struct mips_fdt_fixup realtek_fdt_fixups[] __initconst = {
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{ realtek_add_initrd, "add initrd" },
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{},
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};
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static __init const void *realtek_fixup_fdt(const void *fdt, const void *match_data)
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{
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static unsigned char fdt_buf[16 << 10] __initdata;
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int err;
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if (fdt_check_header(fdt))
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panic("Corrupt DT");
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fw_init_cmdline();
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err = apply_mips_fdt_fixups(fdt_buf, sizeof(fdt_buf), fdt, realtek_fdt_fixups);
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if (err)
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panic("Unable to fixup FDT: %d", err);
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return fdt_buf;
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}
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static const struct of_device_id realtek_of_match[] __initconst = {
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{ .compatible = "realtek,rtl9302-soc" },
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{}
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};
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MIPS_MACHINE(realtek) = {
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.matches = realtek_of_match,
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.fixup_fdt = realtek_fixup_fdt,
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};
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