Merge pull request #240 from jbruchon/switch-to-gcc

End of transition to GCC-IA16

.gitignore

@@ -13,7 +13,6 @@
 *.a
 *.1.gz
 Kbuild
-dev86
 cross
 
 #
@@ -33,7 +32,6 @@ target
 *.orig
 *.rej
 /*.patch
-elks_todo
 
 #
 # Debugging stuff

Documentation/historic/RELNOTES

@@ -473,7 +473,6 @@ VERSION 0.0.66 NOTES
 	* Added code to doshd_release() so that floppy changes don't cause
 	  corruption from old buffers.
 	* Small change to stack_check() %d changed to %ld for t_endbrk.
-	* Implemented Rob. de Bath changes for Dev86v13.
 	* Added a simple ramdisk driver which can access up to 8 64K
 	  ramdisks. See Documentation/ramdisk.txt.
 	* Re-organised the way the debugging macros work, so they now have
@@ -781,13 +780,6 @@ VERSION 0.0.53(.1) NOTES
 	  again. (I suspect the bug predates bug reports though). Instead
 	  of going to the next track/head it was going back one sector,
 	  which was bad.
-	* If you don't know already, this release is meant to install
-	  over/into Dev86 0.0.11, so if you haven't gotten it already *get
-	  it now!!!* To get everything working you have to unpack Dev86,
-	  then unpack elks, build the (slightly-modified) Dev86, and then
-	  build the kernel with it. This is done so that you don't have to
-	  manually change dev86, and it dosen't really change anything
-	  except the libc/syscall directory and the rules.86 file.
 	* minish unpacks into the tests/ directory, along with a new
 	  makefile.
 	* Optimization is turned off, since there appears to be something

Documentation/html/user/writing_apps_in_C.html

@@ -31,20 +31,9 @@
 		<TD WIDTH=710 VALIGN=TOP>
 			<H2 CLASS="western"><SPAN STYLE="font-style: normal">Writing
 			applications for ELKS in C</SPAN></H2>
-			<P STYLE="margin-bottom: 0.5cm"><FONT FACE="Arial, sans-serif">ELKS
-			and application programs for ELKS are cross-compiled on a standard
-			Linux system with the dev86 package. This contains the bcc C
-			compiler, the ld86 linker, the as86 assembler and the ar86
-			archiver. You can download the dev86 package from the repository
-			of your Linux distribution or download it here:
-			<A HREF="https://github.com/jbruchon/dev86">https://github.com/jbruchon/dev86</A>
-			and compile and install it from this source code.</FONT></P>
-			<P STYLE="margin-bottom: 0.5cm"><FONT FACE="Arial, sans-serif">The
-			package also includes the elksemu program which allows 8086 ELKS
-			programs to be run under Linux-i386. These programs can be
-			compiled using the bcc compiler. However, elksemu will not run on
-			64bit Linux distributions. Therefore test the programs using Qemu
-			instead as described in the next chapter.</FONT></P>
+			<p>ELKS and application programs for ELKS are cross-compiled on
+			a standard Linux system with GCC-IA16.</p>
+			<p>Test the programs using Qemu as described in the next chapter.</p>
 			<P STYLE="margin-bottom: 0.5cm"><FONT FACE="Arial, sans-serif">For
 			a start let's compile a &bdquo;hello world&ldquo; program and run
 			that in ELKS. Here is the code:</FONT></P>

Makefile

@@ -31,11 +31,13 @@ CFG_SHELL	:= $(shell \
 .PHONY: all clean kconfig defconfig config menuconfig
 
 all: .config
+	$(MAKE) -C libc all
 	$(MAKE) -C elks all
 	$(MAKE) -C elkscmd all
 	$(MAKE) -C image all
 
 clean:
+	$(MAKE) -C libc clean
 	$(MAKE) -C elks clean
 	$(MAKE) -C elkscmd clean
 	$(MAKE) -C image clean

README

@@ -1,21 +1,31 @@
                ELKS, the Embeddable Linux Kernel Subset
                ----------------------------------------
 
-This is a project to write a Linux-like operating system for systems based on
-the Intel IA16 architecture (16 bits processors: i8088, i8086, i80188, i80186,
-i80286, V20, V30 and compatibles).
 
-Such systems are ancient computers (IBM-PC XT/AT and clones) or more recent
-embedded ones that reuse their huge hardware & software legacy.
+What is this ?
+--------------
 
-To build ELKS, you need a cross build chain, mainly based on DEV86 (still used
-for the user land) and GCC-IA16 (now used for the kernel).
+This is a project to write a Linux-like OS for systems based on the Intel
+IA16 architecture (16 bits processors: 8088, 8086, 80188, 80186, 80286,
+Nec V20, V30 and compatibles).
 
-A script is provided to automatically download and build that cross chain:
+Such systems are ancient computers (IBM-PC XT / AT and clones), or more
+recent SBC / SoC / FPGA that reuse the huge hardware & software legacy
+from that popular platform.
+
+
+How to build ?
+--------------
+
+To build ELKS, you need a cross build tool chain, mainly based on the latest
+GCC-IA16 (DEV86 including BCC was used for previous versions, but has been
+dropped because it was obsolete and no more actively maintained).
+
+A script is provided to automatically download and build that tool chain:
 
   'tools/build.sh'
 
-Note: all the scripts must be executed with the top folder 'elks/' as the
+Note: all the scripts must be executed within the top folder 'elks/' as the
 current one.
 
 A script is provided to automate the whole build process (configuration,
@@ -46,10 +56,14 @@ The general build procedure for ELKS is as follows:
 The target root folder is built in 'target/', and depending on your
 configuration, that folder is packed as either a floppy disk image (fd1440,
 fd1680, fd1200, fd720, fd360, without MBR), a hard-disk image (hd, with MBR),
-or a file image (rom, tar), into the '/image' folder.
+or a file image (ROM, TAR), into the '/image' folder.
 
 Before writting the image on the real device, you can test it first on QEMU
-with './qemu.sh' (will configure QEMU for an ISA system).
+with './qemu.sh' (will configure QEMU as an ISA system).
+
+
+More information
+----------------
 
 Questions? Problems? Patches? Open an issue in this project! You can also join
 and email the 'Linux-8086' list at [email protected].

build.sh

@@ -29,21 +29,17 @@ clean_exit () {
 	exit $E
 }
 
-# Disk images cannot be built unless we're UID 0
-if [ "$UID" != "0" ] && [ "$1" != "clean" ]
-	then echo -e "\nWARNING: Disk images can only be built if you have root permissions"
-fi
-
 # Build environment setup
+# TODO: check script status on return
 . tools/env.sh
 
 # Check tools
-if [ ! -x "$CROSSDIR/bin/bcc" ]
+if [ ! -x "$CROSSDIR/bin/ia16-elf-gcc" ]
 	then
-	echo "ERROR: BCC not found. You must build the cross tools"
+	echo "ERROR: GCC-IA16 not found. You must build the cross tools"
 	echo "       before attempting to build ELKS. Run tools/build.sh"
 	echo "       to automatically build that cross tools. Aborting."
-	exit 1
+	clean_exit 1
 fi
 
 # Working directory