added howto for building

Makefile

@@ -447,6 +447,7 @@ minisatip-package: dist/packages/minisatip-$(VERSION).tar.gz
 apps/$(BUSYBOX)/Makefile:
 	$(call WGET,http://busybox.net/downloads/$(BUSYBOX).tar.bz2,apps/$(BUSYBOX).tar.bz2)
 	tar -C apps -xjf apps/$(BUSYBOX).tar.bz2
+	patch -p0 < patches/busybox-1.26.2.patch
 
 apps/$(BUSYBOX)/busybox: apps/$(BUSYBOX)/Makefile
 	make -C apps/$(BUSYBOX) CROSS_COMPILE=$(TOOLCHAIN)/bin/sh4-linux- defconfig

debug/README.md

@@ -4,9 +4,21 @@ A notes for developers (might be outdated):
 Requirements:
 
   - git, python
+  - distro with yum
   - STLinux 2.4 (all-sh4-glibc) - http://www.stlinux.com - installed to /opt/STM/STLinux-2.4/
   - fakeroot package/tools
 
+Preparing build env:
+  - Install a clean distro with yum package manager (CentOS 7 confirmed to work)
+  - Install STLinux toolchain:
+    - download http://archive.stlinux.com/stlinux/2.4/iso/STLinux-2.4-sh4-20141119.iso
+    - mount it somewhere and cd to that dir
+    - ./install all-sh4-glibc
+    - this will create /opt/STM/STLinux-2.4/
+  - yum install epel-release
+  - yum install gcc git python wget tar bzip2 uboot-tools patch fakeroot svn file
+  - cd ~ ; git clone https://github.com/perexg/satip-axe ; cd satip-axe
+
 Compilation:
 
   - just type 'make'

patches/busybox-1.26.2.patch

@@ -0,0 +1,25 @@
+--- apps/busybox-1.26.2/util-linux/blkdiscard.c	2016-12-10 17:46:36.000000000 +0000
++++ apps/busybox-1.26.2/util-linux/blkdiscard.c	2019-03-03 12:56:57.041509277 +0000
+@@ -68,7 +68,7 @@
+ 	range[0] = offset;
+ 	range[1] = length;
+ 	ioctl_or_perror_and_die(fd,
+-			(opts & OPT_SECURE) ? BLKSECDISCARD : BLKDISCARD,
++			(opts & OPT_SECURE) ? BLKDISCARD : BLKDISCARD,
+ 			&range,
+ 			"%s: %s failed",
+ 			argv[0],
+--- apps/busybox-1.26.2/miscutils/nandwrite.c	2016-09-27 16:53:50.000000000 +0000
++++ apps/busybox-1.26.2/miscutils/nandwrite.c	2019-03-03 12:56:27.520549923 +0000
+@@ -53,6 +53,11 @@
+
+ #include "libbb.h"
+ #include <mtd/mtd-user.h>
++#include <linux/version.h>
++#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 2, 0)
++# define MTD_FILE_MODE_NORMAL MTD_MODE_NORMAL
++# define MTD_FILE_MODE_RAW MTD_MODE_RAW
++#endif
+
+ #define IS_NANDDUMP  (ENABLE_NANDDUMP && (!ENABLE_NANDWRITE || (applet_name[4] == 'd')))
+ #define IS_NANDWRITE (ENABLE_NANDWRITE && (!ENABLE_NANDDUMP || (applet_name[4] != 'd')))