move WIP u-boot modifications in libre-testing

I asked bill-auger to push his modifications so he uploaded the
packages to libre-testing and the PKGBUILD modifications to abslibre.

Since the pakcages have been uploaded to libre-testing it's better to
move them here.

While the code is not ready yet, it enables users to test the new
u-boot which fixes the Ethernet PHY. From linux-sunxi we have[1]:
    Proper fix for rev. F and newer is to apply trace length
    compensation at the PHY.

    This is done by default (also for rev. H and newer despite commit
    message mentioning only realtek not Micrel) since mainline linux
    v5.15 and since mainline u-boot v2022.04;

[1]https://linux-sunxi.org/Olimex_A20-OLinuXino-Lime2#calibrate_at_PHY

That page also has more background on the issue being fixed here
(basically making all the various Lime 2 A20 revisions (which have
different Ethernet PHY) work with the same u-boot binary / package.

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

1 files changed, 141 insertions, 0 deletions

diff --git a/libre-testing/uboot4extlinux-sunxi/generate-uboot4extlinux-sunxi-install-text.sh b/libre-testing/uboot4extlinux-sunxi/generate-uboot4extlinux-sunxi-install-text.sh
new file mode 100644
index 000000000..e8c9c29a9
--- /dev/null
+++ b/libre-testing/uboot4extlinux-sunxi/generate-uboot4extlinux-sunxi-install-text.sh
@@ -0,0 +1,141 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0+
+# Copyright (C) 2020 Denis 'GNUtoo' Carikli
+
+line_length=81
+
+printchar()
+{
+    char="$1"
+    nr_chars="$2"
+
+    if [ -z "${nr_chars}" ] ; then
+        echo -n "${char}"
+    else
+        i=0
+        while [ $i -lt ${nr_chars} ] ; do
+            echo -n "${char}"
+            i=$(expr $i + 1)
+        done
+    fi
+}
+
+print_separation_line()
+{
+    echo -n "+"
+    printchar "-" $(expr ${line_length} - 2)
+    echo  "+"
+}
+
+strlen()
+{
+    echo $(expr $(echo "$1" | wc -c) - 1)
+}
+
+print_header()
+{
+    pkgname="$1"
+
+    # ${line_length}
+    # - '| '
+    # - ${pkgname}
+    # - ' '
+    # - 'installation instructions:'
+    # - ' |'
+    extra_spaces=$(expr ${line_length} - 2 - $(strlen "${pkgname}") - 1)
+    extra_spaces=$(expr ${extra_spaces} - \
+                $(strlen "installation instructions:") - 2)
+
+    print_separation_line
+    echo -n "| "
+    echo -n "${pkgname} installation instructions:"
+    printchar " " "${extra_spaces}"
+    echo " |"
+    print_separation_line
+}
+
+print_line()
+{
+    line="$1"
+
+    # ${line_length} - '| ' - ${line} -  ' |'
+    extra_spaces=$(expr ${line_length} - 2 - $(strlen "${line}") - 2)
+    echo -n '| '
+    echo -n "${line}"
+    printchar " " "${extra_spaces}"
+    echo ' |'
+}
+
+print_text()
+{
+    for line in "$@" ; do
+        print_line "${line}"
+    done
+}
+
+print_introduction()
+{
+    print_text \
+        "To boot with u-boot you will need to do two things:" \
+        "- First you will need to install u-boot to the storage device (like" \
+        "  a microSD) you will be booting from. You can consult the Parabola" \
+        "  installation instructions to know which storage devices are" \
+        "  supported." \
+        "- Then you will need to read and potentially modify the" \
+        "  /boot/extlinux/extlinux.conf configuration file to tell u-boot" \
+        "  from which kernel to boot, and various other settings related to" \
+        "  booting (like LVM or disk encryption settings)."
+}
+
+print_uboot_install_instructions()
+{
+    pkgname="$1"
+    install_script="$2"
+
+    print_text \
+           "To install or upgrade u-boot you can use similar commands:" \
+           "    cd $(dirname ${script})" \
+           "    sudo ./$(basename ${script}) <path/to/block-device>"
+
+    print_line ""
+
+    print_text \
+       "For instance if the microSD you (will) boot from is available at" \
+       "/dev/mmcblk0 you can use the following commands:" \
+           "    cd $(dirname ${script})" \
+           "    sudo ./$(basename ${script}) /dev/mmcblk0"
+
+    print_line ""
+
+    print_text \
+       "Instead if the microSD is available at /dev/sdb you can use the" \
+       "following commands:" \
+           "    cd $(dirname ${script})" \
+           "    sudo ./$(basename ${script}) /dev/sdb"
+}
+
+print_extlinux_config_remainder()
+{
+    pkgbase="$1"
+
+    print_text \
+       "When this is done you'll need to create and/or modify the" \
+       "/boot/extlinux/extlinux.conf configuration file."
+    print_line ""
+
+    print_text \
+        "There is an example file for that at" \
+        "/usr/lib/u-boot/${pkgbase}/extlinux.conf"
+}
+
+pkgname="$1"
+pkgbase="$2"
+script="$3"
+
+print_header "${pkgname}"
+print_introduction
+print_line " "
+print_uboot_install_instructions "${pkgname}" "${script}"
+print_line " "
+print_extlinux_config_remainder "${pkgbase}"
+print_separation_line