d0403b14e3
Cleaned up build files, resources, scripts. Made the image use a partition map to fix mmc issues Signed-off-by: SolidHal <solidhal@users.noreply.github.com>
134 lines
5.0 KiB
Diff
134 lines
5.0 KiB
Diff
From 0f09019241a0ea6eee0b9b596a70ec8a66b820ce Mon Sep 17 00:00:00 2001
|
|
From: SolidHal <hal@halemmerich.com>
|
|
Date: Fri, 24 Aug 2018 11:04:43 -0500
|
|
Subject: [PATCH] block: partitions: efi: Add support for IGNOREME GPT
|
|
signature
|
|
|
|
This patch adds support for a special GPT header signature marker (using
|
|
the string 'IGNOREME' instead of the spec's 'EFI PART'). This tells the
|
|
kernel to ignore this GPT completely and look at the other one instead.
|
|
Since the kernel always prefers the primary GPT anyway, all we really
|
|
need to do effectively is to check whether the primary GPT is marked
|
|
'IGNOREME' and force evaluation of the secondary one in that case.
|
|
|
|
Borrowed from the chrome os 3.14 kernel, the commit can be found here:
|
|
https://chromium.googlesource.com/chromiumos/third_party/kernel/+/abba28d0a1b7361da6e2023352e92687166ca30d
|
|
|
|
Also bundled in this commit
|
|
https://chromium.googlesource.com/chromiumos/third_party/kernel/+/bd0c62c7de0c8a63314b7955e5718d8f6192f9d2%5E%21/#F0
|
|
Which is a small compiler warning fix for the above patch
|
|
|
|
This patch fixes how the kernel detects and handles certain mmc
|
|
manufatures devices, and allows the partitions on the mmc to be bootable
|
|
and mountable.
|
|
|
|
Signed-off-by: SolidHal <hal@halemmerich.com>
|
|
---
|
|
block/partitions/efi.c | 31 ++++++++++++++++++++++---------
|
|
block/partitions/efi.h | 3 ++-
|
|
2 files changed, 24 insertions(+), 10 deletions(-)
|
|
|
|
diff --git a/block/partitions/efi.c b/block/partitions/efi.c
|
|
index 39f70d9..aa08380 100644
|
|
--- a/block/partitions/efi.c
|
|
+++ b/block/partitions/efi.c
|
|
@@ -344,23 +344,34 @@ static gpt_header *alloc_read_gpt_header(struct parsed_partitions *state,
|
|
* @lba: logical block address of the GPT header to test
|
|
* @gpt: GPT header ptr, filled on return.
|
|
* @ptes: PTEs ptr, filled on return.
|
|
+ * @ignored is filled on return with 1 if this is an IGNOREME GPT,
|
|
+ * 0 otherwise. May be NULL.
|
|
*
|
|
* Description: returns 1 if valid, 0 on error.
|
|
* If valid, returns pointers to newly allocated GPT header and PTEs.
|
|
*/
|
|
static int is_gpt_valid(struct parsed_partitions *state, u64 lba,
|
|
- gpt_header **gpt, gpt_entry **ptes)
|
|
+ gpt_header **gpt, gpt_entry **ptes, int *ignored)
|
|
{
|
|
u32 crc, origcrc;
|
|
u64 lastlba, pt_size;
|
|
|
|
+ if (ignored)
|
|
+ *ignored = 0;
|
|
if (!ptes)
|
|
return 0;
|
|
if (!(*gpt = alloc_read_gpt_header(state, lba)))
|
|
return 0;
|
|
|
|
/* Check the GUID Partition Table signature */
|
|
- if (le64_to_cpu((*gpt)->signature) != GPT_HEADER_SIGNATURE) {
|
|
+
|
|
+ if (le64_to_cpu((*gpt)->signature) == GPT_HEADER_SIGNATURE_IGNORED) {
|
|
+ pr_debug("GUID Partition Table at LBA %llu marked IGNOREME\n",
|
|
+ (unsigned long long)lba);
|
|
+ if (ignored)
|
|
+ *ignored = 1;
|
|
+ goto fail;
|
|
+ } else if (le64_to_cpu((*gpt)->signature) != GPT_HEADER_SIGNATURE) {
|
|
pr_debug("GUID Partition Table Header signature is wrong:"
|
|
"%lld != %lld\n",
|
|
(unsigned long long)le64_to_cpu((*gpt)->signature),
|
|
@@ -597,7 +608,7 @@ compare_gpts(gpt_header *pgpt, gpt_header *agpt, u64 lastlba)
|
|
static int find_valid_gpt(struct parsed_partitions *state, gpt_header **gpt,
|
|
gpt_entry **ptes)
|
|
{
|
|
- int good_pgpt = 0, good_agpt = 0, good_pmbr = 0;
|
|
+ int good_pgpt = 0, good_agpt = 0, good_pmbr = 0, pgpt_ignored = 0;
|
|
gpt_header *pgpt = NULL, *agpt = NULL;
|
|
gpt_entry *pptes = NULL, *aptes = NULL;
|
|
legacy_mbr *legacymbr;
|
|
@@ -627,19 +638,20 @@ static int find_valid_gpt(struct parsed_partitions *state, gpt_header **gpt,
|
|
}
|
|
|
|
good_pgpt = is_gpt_valid(state, GPT_PRIMARY_PARTITION_TABLE_LBA,
|
|
- &pgpt, &pptes);
|
|
+ &pgpt, &pptes, &pgpt_ignored);
|
|
if (good_pgpt)
|
|
good_agpt = is_gpt_valid(state,
|
|
le64_to_cpu(pgpt->alternate_lba),
|
|
- &agpt, &aptes);
|
|
- if (!good_agpt && force_gpt)
|
|
- good_agpt = is_gpt_valid(state, lastlba, &agpt, &aptes);
|
|
+ &agpt, &aptes, NULL);
|
|
+ if (!good_agpt && (force_gpt || pgpt_ignored))
|
|
+ good_agpt = is_gpt_valid(state, lastlba, &agpt, &aptes, NULL);
|
|
|
|
/* The obviously unsuccessful case */
|
|
if (!good_pgpt && !good_agpt)
|
|
goto fail;
|
|
|
|
- compare_gpts(pgpt, agpt, lastlba);
|
|
+ if (!pgpt_ignored)
|
|
+ compare_gpts(pgpt, agpt, lastlba);
|
|
|
|
/* The good cases */
|
|
if (good_pgpt) {
|
|
@@ -656,7 +668,8 @@ static int find_valid_gpt(struct parsed_partitions *state, gpt_header **gpt,
|
|
*ptes = aptes;
|
|
kfree(pgpt);
|
|
kfree(pptes);
|
|
- pr_warn("Primary GPT is invalid, using alternate GPT.\n");
|
|
+ pr_warn("Primary GPT is %s, using alternate GPT.\n",
|
|
+ pgpt_ignored ? "being ignored" : "invalid");
|
|
return 1;
|
|
}
|
|
|
|
diff --git a/block/partitions/efi.h b/block/partitions/efi.h
|
|
index abd0b19..36cddc8 100644
|
|
--- a/block/partitions/efi.h
|
|
+++ b/block/partitions/efi.h
|
|
@@ -41,7 +41,8 @@
|
|
#define GPT_MBR_PROTECTIVE 1
|
|
#define GPT_MBR_HYBRID 2
|
|
|
|
-#define GPT_HEADER_SIGNATURE 0x5452415020494645ULL
|
|
+#define GPT_HEADER_SIGNATURE 0x5452415020494645ULL /* 'EFI PART' */
|
|
+#define GPT_HEADER_SIGNATURE_IGNORED 0x454d45524f4e4749ULL /* 'IGNOREME' */
|
|
#define GPT_HEADER_REVISION_V1 0x00010000
|
|
#define GPT_PRIMARY_PARTITION_TABLE_LBA 1
|
|
|
|
--
|
|
2.11.0
|
|
|