diff options
| author | Martyn Welch <martyn.welch@collabora.com> | 2024-10-09 14:15:38 +0100 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2024-10-15 10:24:27 -0600 |
| commit | d2faad3ff31f0fab0cf280c05ee333992f7a7d27 (patch) | |
| tree | db4686097e1a44fb9717dc4ab0c79916a896c684 /boot/pxe_utils.c | |
| parent | d2061828a4c1b60b44cd2307b6a782ac2efbffbe (diff) | |
boot: pxe_utils: Add fallback support
When configured correctly, we can detect when boot fails after the boot
process has been handed over to the kernel through the use of U-Boot's
bootcount support. In some instances, such as when we are performing
atomic updates via a system such as OSTree, it is desirable to provide a
fallback option so that we can return to a previous (hopefully working)
state.
Add a "fallback" option to the supported extlinux configuration options
that points to a label like "default" so that we can utilise this in
later commits.
Signed-off-by: Martyn Welch <martyn.welch@collabora.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'boot/pxe_utils.c')
| -rw-r--r-- | boot/pxe_utils.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/boot/pxe_utils.c b/boot/pxe_utils.c index 4e27842b088..a80119c9a3b 100644 --- a/boot/pxe_utils.c +++ b/boot/pxe_utils.c @@ -781,6 +781,7 @@ enum token_type { T_IPAPPEND, T_BACKGROUND, T_KASLRSEED, + T_FALLBACK, T_INVALID }; @@ -814,6 +815,7 @@ static const struct token keywords[] = { {"ipappend", T_IPAPPEND,}, {"background", T_BACKGROUND,}, {"kaslrseed", T_KASLRSEED,}, + {"fallback", T_FALLBACK,}, {NULL, T_INVALID} }; @@ -1356,6 +1358,18 @@ static int parse_pxefile_top(struct pxe_context *ctx, char *p, unsigned long bas break; + case T_FALLBACK: + err = parse_sliteral(&p, &label_name); + + if (label_name) { + if (cfg->fallback_label) + free(cfg->fallback_label); + + cfg->fallback_label = label_name; + } + + break; + case T_INCLUDE: err = handle_include(ctx, &p, base + ALIGN(strlen(b), 4), cfg, @@ -1395,6 +1409,7 @@ void destroy_pxe_menu(struct pxe_menu *cfg) free(cfg->title); free(cfg->default_label); + free(cfg->fallback_label); list_for_each_safe(pos, n, &cfg->labels) { label = list_entry(pos, struct pxe_label, list); |