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1068acd2c0297c5cfd35951de062568f3f2fa0e8
lbmk/config/coreboot/default/patches/0005-util-ifdtool-add-nuke-flag-all-0xFF-on-region.patch
Leah Rowe 1068acd2c0 coreboot/default: new rev ed5a993f 
latest coreboot rev as of literally today

this is in preparation for a thinkpad x270 port
using a WIP patch that was contributed

Signed-off-by: Leah Rowe <leah@libreboot.org>
2026-02-19 15:36:22 +00:00

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From f56c11820745dceffdfb52caaa45f64942200fb7 Mon Sep 17 00:00:00 2001
From: Leah Rowe <info@minifree.org>
Date: Sun, 19 Feb 2023 18:21:43 +0000
Subject: [PATCH 05/45] util/ifdtool: add --nuke flag (all 0xFF on region)
When this option is used, the region's contents are overwritten
with all ones (0xFF).
Example:
./ifdtool --nuke gbe coreboot.rom
./ifdtool --nuke bios coreboot.com
./ifdtool --nuke me coreboot.com
Rebased since the last revision update in lbmk.
Signed-off-by: Leah Rowe <leah@libreboot.org>
---
util/ifdtool/ifdtool.c | 116 +++++++++++++++++++++++++++++------------
1 file changed, 84 insertions(+), 32 deletions(-)
diff --git a/util/ifdtool/ifdtool.c b/util/ifdtool/ifdtool.c
index 0592785bf6..cab934c3a5 100644
--- a/util/ifdtool/ifdtool.c
+++ b/util/ifdtool/ifdtool.c
@@ -2240,6 +2240,7 @@ static void print_usage(const char *name)
" tgl - Tiger Lake\n"
" wbg - Wellsburg\n"
" -S | --setpchstrap Write a PCH strap\n"
+ " -N | --nuke <region> Overwrite the specified region with 0xFF (all ones)\n"
" -V | --newvalue The new value to write into PCH strap specified by -S\n"
" -T | --topswapsize Set the Top Swap Block Size PCH strap value\n"
" Possible values: 0x10000, 0x20000, 0x40000, 0x80000,\n"
@@ -2251,6 +2252,60 @@ static void print_usage(const char *name)
"\n");
}
+static int
+get_region_type_string(const char *region_type_string)
+{
+ if (!strcasecmp("Descriptor", region_type_string))
+ return 0;
+ else if (!strcasecmp("BIOS", region_type_string))
+ return 1;
+ else if (!strcasecmp("ME", region_type_string))
+ return 2;
+ else if (!strcasecmp("GbE", region_type_string))
+ return 3;
+ else if (!strcasecmp("Platform Data", region_type_string))
+ return 4;
+ else if (!strcasecmp("Device Exp1", region_type_string))
+ return 5;
+ else if (!strcasecmp("Secondary BIOS", region_type_string))
+ return 6;
+ else if (!strcasecmp("Reserved", region_type_string))
+ return 7;
+ else if (!strcasecmp("EC", region_type_string))
+ return 8;
+ else if (!strcasecmp("Device Exp2", region_type_string))
+ return 9;
+ else if (!strcasecmp("IE", region_type_string))
+ return 10;
+ else if (!strcasecmp("10GbE_0", region_type_string))
+ return 11;
+ else if (!strcasecmp("10GbE_1", region_type_string))
+ return 12;
+ else if (!strcasecmp("PTT", region_type_string))
+ return 15;
+ return -1;
+}
+
+static void
+nuke(const char *filename, char *image, int size, int region_type)
+{
+ int i;
+ struct region region;
+ const struct frba *frba = find_frba(image, size);
+ if (!frba)
+ exit(EXIT_FAILURE);
+
+ region = get_region(frba, region_type);
+ if (region.size > 0) {
+ for (i = region.base; i <= region.limit; i++) {
+ if ((i + 1) > (size))
+ break;
+ image[i] = 0xFF;
+ }
+ write_image(filename, image, size);
+ }
+}
+
int main(int argc, char *argv[])
{
int opt, option_index = 0;
@@ -2258,6 +2313,7 @@ int main(int argc, char *argv[])
int mode_em100 = 0, mode_locked = 0, mode_unlocked = 0, mode_validate = 0;
int mode_layout = 0, mode_newlayout = 0, mode_density = 0, mode_setstrap = 0;
int mode_read = 0, mode_altmedisable = 0, altmedisable = 0, mode_fmap_template = 0;
+ int mode_nuke = 0;
int mode_gpr0_disable = 0, mode_gpr0_enable = 0, mode_gpr0_status = 0;
int mode_settopswapsize = 0;
char *region_type_string = NULL, *region_fname = NULL, *layout_fname = NULL;
@@ -2294,6 +2350,7 @@ int main(int argc, char *argv[])
{"setpchstrap", 1, NULL, 'S'},
{"newvalue", 1, NULL, 'V'},
{"topswapsize", 1, NULL, 'T'},
+ {"nuke", 1, NULL, 'N'},
{0, 0, 0, 0}
};
@@ -2343,35 +2400,8 @@ int main(int argc, char *argv[])
region_fname++;
// Descriptor, BIOS, ME, GbE, Platform
// valid type?
- if (!strcasecmp("Descriptor", region_type_string))
- region_type = 0;
- else if (!strcasecmp("BIOS", region_type_string))
- region_type = 1;
- else if (!strcasecmp("ME", region_type_string))
- region_type = 2;
- else if (!strcasecmp("GbE", region_type_string))
- region_type = 3;
- else if (!strcasecmp("Platform Data", region_type_string))
- region_type = 4;
- else if (!strcasecmp("Device Exp1", region_type_string))
- region_type = 5;
- else if (!strcasecmp("Secondary BIOS", region_type_string))
- region_type = 6;
- else if (!strcasecmp("Reserved", region_type_string))
- region_type = 7;
- else if (!strcasecmp("EC", region_type_string))
- region_type = 8;
- else if (!strcasecmp("Device Exp2", region_type_string))
- region_type = 9;
- else if (!strcasecmp("IE", region_type_string))
- region_type = 10;
- else if (!strcasecmp("10GbE_0", region_type_string))
- region_type = 11;
- else if (!strcasecmp("10GbE_1", region_type_string))
- region_type = 12;
- else if (!strcasecmp("PTT", region_type_string))
- region_type = 15;
- if (region_type == -1) {
+ if ((region_type =
+ get_region_type_string(region_type_string)) == -1) {
fprintf(stderr, "No such region type: '%s'\n\n",
region_type_string);
fprintf(stderr, "run '%s -h' for usage\n", argv[0]);
@@ -2552,7 +2582,23 @@ int main(int argc, char *argv[])
mode_settopswapsize = 1;
top_swap_size_arg = optarg;
break;
- case 'v':
+ case 'N':
+ region_type_string = strdup(optarg);
+ if (!region_type_string) {
+ fprintf(stderr, "No region specified\n");
+ print_usage(argv[0]);
+ exit(EXIT_FAILURE);
+ }
+ if ((region_type =
+ get_region_type_string(region_type_string)) == -1) {
+ fprintf(stderr, "No such region type: '%s'\n\n",
+ region_type_string);
+ print_usage(argv[0]);
+ exit(EXIT_FAILURE);
+ }
+ mode_nuke = 1;
+ break;
+ Case 'v':
print_version();
exit(EXIT_SUCCESS);
break;
@@ -2571,7 +2617,8 @@ int main(int argc, char *argv[])
if ((mode_dump + mode_layout + mode_fmap_template + mode_extract + mode_inject +
mode_setstrap + mode_settopswapsize + mode_newlayout + (mode_spifreq | mode_em100 |
mode_unlocked | mode_locked) + mode_altmedisable + mode_validate +
- (mode_gpr0_disable | mode_gpr0_enable) + mode_gpr0_status) > 1) {
+ (mode_gpr0_disable | mode_gpr0_enable) + mode_gpr0_status +
+ mode_nuke) > 1) {
fprintf(stderr, "You may not specify more than one mode.\n\n");
fprintf(stderr, "run '%s -h' for usage\n", argv[0]);
exit(EXIT_FAILURE);
@@ -2580,7 +2627,8 @@ int main(int argc, char *argv[])
if ((mode_dump + mode_layout + mode_fmap_template + mode_extract + mode_inject +
mode_setstrap + mode_settopswapsize + mode_newlayout + mode_spifreq + mode_em100 +
mode_locked + mode_unlocked + mode_density + mode_altmedisable +
- mode_validate + (mode_gpr0_disable | mode_gpr0_enable) + mode_gpr0_status) == 0) {
+ mode_validate + (mode_gpr0_disable | mode_gpr0_enable) + mode_gpr0_status +
+ mode_nuke) == 0) {
fprintf(stderr, "You need to specify a mode.\n\n");
fprintf(stderr, "run '%s -h' for usage\n", argv[0]);
exit(EXIT_FAILURE);
@@ -2746,6 +2794,10 @@ int main(int argc, char *argv[])
write_image(new_filename, image, size);
}
+ if (mode_nuke) {
+ nuke(new_filename, image, size, region_type);
+ }
+
if (mode_altmedisable) {
struct fpsba *fpsba = find_fpsba(image, size);
struct fmsba *fmsba = find_fmsba(image, size);
--
2.47.3
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