libre: uboot4extlinux-sunxi: lower maintenance costs

- We can now do cross builds of u-boot:
  - We can now more easily work on the package as we don't need
    an ARM computer for that anymore.
  - It also enable people already using Parabola on x86 to more
    easily install, test, or repair u-boot for an ARM computer
    as users can simply install it on microSD cards without
    needing to use ARM chroots.
- There is now an install script to install u-boot:
  - It makes things easier for users as it is more similar to
    grub-install than dd commands.
  - It also does many checks at the same time to avoid data loss.
- The commands to split packages are now shared between all
  package_ functions. This lower maintenance.
- How to add a new board has been made more clear.

Comparison with other distributions (for consistency):
- u-boot doesn't have anything to handle the installation and
  update of u-boot binaries if UEFI is not used.
- Debian has an u-boot-install-sunxi script which handles way more
  cases than what I wrote (it even handles GPT and so on and even
  has a manual), but there seems to be no tools to update u-boot.
- Openembedded doesn't seem to have anything special in
  the u-boot recipe in openembedded-core

Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>

1 files changed, 85 insertions, 0 deletions

diff --git a/libre/uboot4extlinux-sunxi/0001-Add-tool-to-dump-sunxi-images.patch b/libre/uboot4extlinux-sunxi/0001-Add-tool-to-dump-sunxi-images.patch
new file mode 100644
index 000000000..ee89767f2
--- /dev/null
+++ b/libre/uboot4extlinux-sunxi/0001-Add-tool-to-dump-sunxi-images.patch
@@ -0,0 +1,85 @@
+From b4e67c5112b8d8ec8f9255af057c3515c5ea71c1 Mon Sep 17 00:00:00 2001
+From: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>
+Date: Sat, 29 May 2021 19:14:22 +0200
+Subject: [PATCH] Add tool to dump sunxi images
+
+  $./tools/dumpimage -l ~/work/temp/lime1.img
+  Allwinner eGON image, size: 24576 bytes
+  	SPL header version 0.2
+  	DT name: sun7i-a20-olinuxino-lime2-emmc
+  $ ./tools/dumpimage -l ~/work/temp/parabola.img
+  Allwinner eGON image, size: 24576 bytes
+  	SPL header version 0.2
+  	DT name: sun7i-a20-olinuxino-lime2-emmc
+
+TODO:
+- why do we have the lime2 dt detected above? is the
+  env a leftover from the previous image somehow?
+- Handle block devices:
+  $ sudo ./tools/dumpimage -l /dev/sdb
+  Image Type:   MVEBU Boot from (null) Image
+  Image version:0
+  Data Size:    -4 Bytes = 4194304.00 KiB = 4096.00 MiB
+  Load Address: 00000000
+  Entry Point:  00000000
+- Make it easily parsable by tools
+- Force type to sunxi_egon
+
+Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>
+---
+ tools/dumpimage.c | 16 +++++++++++++---
+ 1 file changed, 13 insertions(+), 3 deletions(-)
+
+diff --git a/tools/dumpimage.c b/tools/dumpimage.c
+index e5481435a7..9d0d0c448b 100644
+--- a/tools/dumpimage.c
++++ b/tools/dumpimage.c
+@@ -71,6 +71,9 @@ int main(int argc, char **argv)
+ 	char *ptr;
+ 	int retval = EXIT_SUCCESS;
+ 	struct image_type_params *tparams = NULL;
++	off_t offset = 0;
++
++	offset = 8192; /* Allwinner SOCs */
+ 
+ 	params.cmdname = *argv;
+ 
+@@ -159,6 +162,14 @@ int main(int argc, char **argv)
+ 		exit(EXIT_FAILURE);
+ 	}
+ 
++	/*  Handle block devices */
++	if (sbuf.st_size == 0) {
++		/* 1M should be sufficient as we have the first partition that
++		 * is typically aligned at 1M for MBR partitioning.
++		 */
++		sbuf.st_size = 1024*1024;
++	}
++
+ 	if ((uint32_t)sbuf.st_size < tparams->header_size) {
+ 		fprintf(stderr, "%s: Bad size: \"%s\" is not valid image\n",
+ 			params.cmdname, params.imagefile);
+@@ -182,7 +193,7 @@ int main(int argc, char **argv)
+ 		 * Extract the data files from within the matched
+ 		 * image type. Returns the error code if not matched
+ 		 */
+-		retval = dumpimage_extract_subimage(tparams, ptr, &sbuf);
++		retval = dumpimage_extract_subimage(tparams, ptr + offset, &sbuf);
+ 		if (retval)
+ 			fprintf(stderr, "%s: Can't extract subimage from %s\n",
+ 				params.cmdname, params.imagefile);
+@@ -191,10 +202,9 @@ int main(int argc, char **argv)
+ 		 * Print the image information for matched image type
+ 		 * Returns the error code if not matched
+ 		 */
+-		retval = imagetool_verify_print_header(ptr, &sbuf, tparams,
++		retval = imagetool_verify_print_header(ptr + offset, &sbuf, tparams,
+ 						       &params);
+ 	}
+-
+ 	(void)munmap((void *)ptr, sbuf.st_size);
+ 	(void)close(ifd);
+ 
+-- 
+2.31.1
+