49a4450563
When updating firmware, it is very often that we may want to preserve
few sections, for example vital product data (VPD) including serial
number, calibration data and cache. A firmware updater has to hard-code
the section names that need to be preserved and is hard to maintain.
A better approach is to specify that in FMAP area flags (the `area_flag`
field) using FMAP_AREA_PRESERVE. With this patchset, a FMD parser flag
"PRESERVE" is introduced and will be converted to FMAP_AREA_PRESERVE
when generating FMAP data (by fmap_from_fmd.c).
For example, The FMD statement:
RO_VPD(PRESERVE)@0x0 16k
will generate an FMAP firmware section that:
area_name = "RO_VPD"
area_offset = 0
area_size = 16384
area_flags = FMAP_AREA_PRESERVE
BUG=chromium:936768
TEST=make; boots on x86 "google/eve" and arm "google/kukui" devices
Manually added 'PRESERVE' to some FMD files, and verify (by running
fmap.py) the output coreboot.rom has FMAP_AREA_PRESERVE set
Change-Id: I51e7d31029b98868a1cab0d26bf04a14db01b1c0
Signed-off-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/31707
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
81 lines
2.1 KiB
C
81 lines
2.1 KiB
C
/*
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* fmap_from_fmd.c, tool to distill flashmap descriptors into raw FMAP sections
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*
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* Copyright (C) 2015 Google, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include "fmap_from_fmd.h"
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#include "common.h"
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#include <assert.h>
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#include <string.h>
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static bool fmap_append_fmd_node(struct fmap **flashmap,
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const struct flashmap_descriptor *section,
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unsigned absolute_watermark) {
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uint16_t flags = 0;
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if (strlen(section->name) >= FMAP_STRLEN) {
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ERROR("Section name ('%s') exceeds %d character FMAP format limit\n",
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section->name, FMAP_STRLEN - 1);
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return false;
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}
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absolute_watermark += section->offset;
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if (section->flags.f.preserve)
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flags |= FMAP_AREA_PRESERVE;
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if (fmap_append_area(flashmap, absolute_watermark, section->size,
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(uint8_t *)section->name, flags) < 0) {
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ERROR("Failed to insert section '%s' into FMAP\n",
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section->name);
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return false;
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}
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fmd_foreach_child(subsection, section) {
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if (!fmap_append_fmd_node(flashmap, subsection,
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absolute_watermark))
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return false;
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}
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return true;
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}
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struct fmap *fmap_from_fmd(const struct flashmap_descriptor *desc)
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{
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assert(desc);
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assert(desc->size_known);
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if (strlen(desc->name) >= FMAP_STRLEN) {
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ERROR("Image name ('%s') exceeds %d character FMAP header limit\n",
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desc->name, FMAP_STRLEN - 1);
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return NULL;
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}
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struct fmap *fmap = fmap_create(desc->offset_known ? desc->offset : 0,
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desc->size, (uint8_t *)desc->name);
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if (!fmap) {
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ERROR("Failed to allocate FMAP header\n");
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return fmap;
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}
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fmd_foreach_child(real_section, desc) {
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if (!fmap_append_fmd_node(&fmap, real_section, 0)) {
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fmap_destroy(fmap);
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return NULL;
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}
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}
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return fmap;
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}
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