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fdt_support.c: Allow late kernel cmdline modification
By declaring board-specific board_fdt_chosen_bootargs() the kernel command line arguments can be adjusted before injecting to flat dt chosen node. Signed-off-by: Niko Mauno <niko.mauno@vaisala.com>
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2 changed files with 21 additions and 1 deletions
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@ -269,6 +269,15 @@ int fdt_initrd(void *fdt, ulong initrd_start, ulong initrd_end)
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return 0;
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}
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/**
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* board_fdt_chosen_bootargs - boards may override this function to use
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* alternative kernel command line arguments
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*/
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__weak char *board_fdt_chosen_bootargs(void)
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{
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return env_get("bootargs");
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}
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int fdt_chosen(void *fdt)
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{
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int nodeoffset;
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@ -286,7 +295,8 @@ int fdt_chosen(void *fdt)
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if (nodeoffset < 0)
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return nodeoffset;
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str = env_get("bootargs");
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str = board_fdt_chosen_bootargs();
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if (str) {
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err = fdt_setprop(fdt, nodeoffset, "bootargs", str,
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strlen(str) + 1);
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@ -185,6 +185,16 @@ int fdt_find_or_add_subnode(void *fdt, int parentoffset, const char *name);
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*/
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int ft_board_setup(void *blob, struct bd_info *bd);
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/**
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* board_fdt_chosen_bootargs() - Arbitrarily amend fdt kernel command line
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*
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* This is used for late modification of kernel command line arguments just
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* before they are added into the /chosen node in flat device tree.
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*
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* @return: pointer to kernel command line arguments in memory
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*/
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char *board_fdt_chosen_bootargs(void);
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/*
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* The keystone2 SOC requires all 32 bit aliased addresses to be converted
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* to their 36 physical format. This has to happen after all fdt nodes
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