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69076dff22
This adds support for specifying FDT overlays in an extlinux/pxelinux
configuration file.
Without this, there is no simple way to apply overlays when the kernel
and fdt is loaded by the pxe command.
This change adds the 'fdtoverlays' keyword for a label, supporting multiple
overlay files to be applied on top of the fdt specified in the 'fdt' or
'devicetree' keyword.
Example:
label linux
kernel /Image
fdt /soc-board.dtb
fdtoverlays /soc-board-function.dtbo
append console=ttyS0,115200 root=/dev/mmcblk0p2 rootwait
This code makes usage of a new variable called fdtoverlay_addr_r used to load
the overlay files without overwritting anything important.
Cc: Tom Rini <trini@konsulko.com>
Cc: Andre Heider <a.heider@gmail.com>
Cc: Jernej Škrabec <jernej.skrabec@siol.net>
Cc: Jonas Karlman <jonas@kwiboo.se>
Tested-by: Jernej Škrabec <jernej.skrabec@siol.net>
Reviewed-by: Jernej Škrabec <jernej.skrabec@siol.net>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
90 lines
3.0 KiB
C
90 lines
3.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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#ifndef __PXE_UTILS_H
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#define __PXE_UTILS_H
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/*
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* A note on the pxe file parser.
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*
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* We're parsing files that use syslinux grammar, which has a few quirks.
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* String literals must be recognized based on context - there is no
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* quoting or escaping support. There's also nothing to explicitly indicate
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* when a label section completes. We deal with that by ending a label
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* section whenever we see a line that doesn't include.
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*
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* As with the syslinux family, this same file format could be reused in the
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* future for non pxe purposes. The only action it takes during parsing that
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* would throw this off is handling of include files. It assumes we're using
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* pxe, and does a tftp download of a file listed as an include file in the
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* middle of the parsing operation. That could be handled by refactoring it to
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* take a 'include file getter' function.
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*/
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/*
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* Describes a single label given in a pxe file.
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*
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* Create these with the 'label_create' function given below.
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*
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* name - the name of the menu as given on the 'menu label' line.
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* kernel - the path to the kernel file to use for this label.
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* append - kernel command line to use when booting this label
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* initrd - path to the initrd to use for this label.
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* attempted - 0 if we haven't tried to boot this label, 1 if we have.
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* localboot - 1 if this label specified 'localboot', 0 otherwise.
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* list - lets these form a list, which a pxe_menu struct will hold.
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*/
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struct pxe_label {
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char num[4];
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char *name;
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char *menu;
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char *kernel;
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char *config;
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char *append;
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char *initrd;
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char *fdt;
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char *fdtdir;
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char *fdtoverlays;
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int ipappend;
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int attempted;
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int localboot;
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int localboot_val;
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struct list_head list;
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};
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/*
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* Describes a pxe menu as given via pxe files.
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*
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* title - the name of the menu as given by a 'menu title' line.
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* default_label - the name of the default label, if any.
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* bmp - the bmp file name which is displayed in background
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* timeout - time in tenths of a second to wait for a user key-press before
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* booting the default label.
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* prompt - if 0, don't prompt for a choice unless the timeout period is
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* interrupted. If 1, always prompt for a choice regardless of
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* timeout.
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* labels - a list of labels defined for the menu.
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*/
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struct pxe_menu {
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char *title;
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char *default_label;
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char *bmp;
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int timeout;
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int prompt;
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struct list_head labels;
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};
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extern bool is_pxe;
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extern int (*do_getfile)(struct cmd_tbl *cmdtp, const char *file_path,
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char *file_addr);
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void destroy_pxe_menu(struct pxe_menu *cfg);
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int get_pxe_file(struct cmd_tbl *cmdtp, const char *file_path,
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unsigned long file_addr);
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int get_pxelinux_path(struct cmd_tbl *cmdtp, const char *file,
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unsigned long pxefile_addr_r);
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void handle_pxe_menu(struct cmd_tbl *cmdtp, struct pxe_menu *cfg);
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struct pxe_menu *parse_pxefile(struct cmd_tbl *cmdtp, unsigned long menucfg);
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int format_mac_pxe(char *outbuf, size_t outbuf_len);
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#endif /* __PXE_UTILS_H */
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