There's no need to obey CHS layout restrictions for LBA reads on LBA disks, it only slows down booting process.
See: https://lists.gnu.org/archive/html/grub-devel/2023-07/msg00001.html --- grub-core/disk/i386/pc/biosdisk.c | 5 ++++- include/grub/disk.h | 3 +++ 2 files changed, 7 insertions(+), 1 deletion(-) diff --git a/grub-core/disk/i386/pc/biosdisk.c b/grub-core/disk/i386/pc/biosdisk.c index f9362d17c..1d6788950 100644 --- a/grub-core/disk/i386/pc/biosdisk.c +++ b/grub-core/disk/i386/pc/biosdisk.c @@ -471,7 +471,7 @@ grub_biosdisk_rw (int cmd, grub_disk_t disk, struct grub_biosdisk_dap *dap; dap = (struct grub_biosdisk_dap *) (GRUB_MEMORY_MACHINE_SCRATCH_ADDR - + (data->sectors + + (GRUB_DISK_MAX_LBA_SECTORS << disk->log_sector_size)); dap->length = sizeof (*dap); dap->reserved = 0; @@ -561,6 +561,9 @@ get_safe_sectors (grub_disk_t disk, grub_disk_addr_t sector) struct grub_biosdisk_data *data = disk->data; grub_uint32_t sectors = data->sectors; + if (data->flags & GRUB_BIOSDISK_FLAG_LBA) + sectors = GRUB_DISK_MAX_LBA_SECTORS; + /* OFFSET = SECTOR % SECTORS */ grub_divmod64 (sector, sectors, &offset); diff --git a/include/grub/disk.h b/include/grub/disk.h index a4b5d13f3..be032a72c 100644 --- a/include/grub/disk.h +++ b/include/grub/disk.h @@ -190,6 +190,9 @@ typedef struct grub_disk_memberlist *grub_disk_memberlist_t; #define GRUB_DISK_MAX_MAX_AGGLOMERATE ((1 << (30 - GRUB_DISK_CACHE_BITS - GRUB_DISK_SECTOR_BITS)) - 1) +/* Maximum number of sectors to read in LBA mode at once */ +#define GRUB_DISK_MAX_LBA_SECTORS 63 + /* Return value of grub_disk_native_sectors() in case disk size is unknown. */ #define GRUB_DISK_SIZE_UNKNOWN 0xffffffffffffffffULL -- 2.41.0 _______________________________________________ Grub-devel mailing list Grub-devel@gnu.org https://lists.gnu.org/mailman/listinfo/grub-devel
