docs: Add fuller accounting of "make check" prerequisites

Many of the prerequisites for exercising the full "make check" test suite
have not been documented. This adds them along with a note that some tests
require elevated privileges to run.

Add an incomplete list of cross compiling toolchain packages for Debian
and trusted sources for other distros.

Add statement at the start of the document to clarify that package names
are from Debian 11.

Signed-off-by: Glenn Washburn <development@efficientek.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

INSTALL

@@ -4,6 +4,9 @@ This is the GRUB.  Welcome.
 
 This file contains instructions for compiling and installing the GRUB.
 
+Where this document refers to packages names, they are named according to the
+Debian 11 package repositories.
+
 The Requirements
 ================
 
@@ -46,10 +49,45 @@ need the following.
 * Autoconf 2.63 or later
 * Automake 1.11 or later
 
+Your distro may package cross-compiling toolchains such as the following
+incomplete list on Debian: gcc-aarch64-linux-gnu, gcc-arm-linux-gnueabihf,
+gcc-mipsel-linux-gnu, and mingw-w64.
+
+More cross compiling toolchains can be found at the following trusted sites:
+
+* https://mirrors.kernel.org/pub/tools/crosstool/
+* https://toolchains.bootlin.com/
+
 Prerequisites for make-check:
 
-* qemu, specifically the binary 'qemu-system-i386'
+* qemu, specifically the binary "qemu-system-ARCH" where ARCH is the
+  architecture GRUB has been built for; the "qemu-system" package on Debian
+  will install all needed qemu architectures
+* OVMF, for EFI platforms (packages ovmf, ovmf-ia32, qemu-efi-arm, and
+  qemu-efi-aarch64)
+* OpenBIOS, for ieee1275 platforms (packages openbios-ppc and openbios-sparc)
 * xorriso 1.2.9 or later, for grub-mkrescue and grub-shell
+* wamerican, for grub-fs-tester
+* mtools, FAT tools for EFI platforms
+
+* If running a Linux kernel the following modules must be loaded:
+  - fuse, loop
+  - btrfs, ext4, f2fs, fat, hfs, hfsplus, jfs, mac-roman, minix, nilfs2,
+    reiserfs, udf, xfs
+  - On newer kernels, the exfat kernel modules may be used instead of the
+    exfat FUSE filesystem
+* The following are Debian named packages required mostly for the full
+  suite of filesystem testing (but some are needed by other tests as well):
+  - btrfs-progs, dosfstools, e2fsprogs, exfatprogs, f2fs-tools, genromfs,
+    hfsprogs, jfsutils, nilfs-tools, ntfs-3g, reiserfsprogs, squashfs-tools,
+    reiserfsprogs, udftools, xfsprogs, zfs-fuse
+  - exfat-fuse, if not using the exfat kernel module
+  - gzip, lzop, xz-utils
+  - attr, cpio, g++, gawk, parted, recode, tar, util-linux
+
+Note that `make check' will run and many tests may complete successfully
+with only a subset of these prerequisites. However, some tests may be
+skipped or fail due to missing prerequisites.
 
 Configuring the GRUB
 ====================
@@ -101,7 +139,8 @@ The simplest way to compile this package is:
   6. Type `make' to compile the package.
 
   7. Optionally, type `make check' to run any self-tests that come with
-     the package.
+     the package. Note that many of the tests require root privileges in
+     order to run.
 
   8. Type `make install' to install the programs and any data files and
      documentation.