Add basic support for the Blackfin architecture

For uClibc, the name of the Blackfin architecture is 'bfin'. Actually,
the naming of the architecture is quite messy: for toolchain tuples
and uClibc, it's bfin, but for the kernel, it's blackfin. We've
arbitraly choosen to name it "blackfin" in Crosstool-NG.

Add Blackfin-related uClibc patch to fix a build failure related to
fork() being used in unistd/daemon.c.

Yann E. MORIN:
Apply the patch to the kernel/linux build script to use 'linux'
in the noMMU tuples. See:
  http://sourceware.org/ml/crossgcc/2010-04/msg00010.html

5 files changed, 70 insertions, 6 deletions

diff --git a/config/arch/blackfin.in b/config/arch/blackfin.in
new file mode 100644
index 0000000..f4515e5
--- /dev/null
+++ b/config/arch/blackfin.in
@@ -0,0 +1,12 @@
+# Blackfin specific configuration file
+
+config ARCH_blackfin
+    select ARCH_SUPPORTS_32
+    select ARCH_DEFAULT_32
+    select ARCH_DEFAULT_LE
+    select ARCH_SUPPORT_ARCH
+    select ARCH_SUPPORT_CPU
+    select ARCH_SUPPORT_TUNE
+    select ARCH_SUPPORT_FPU
+     help
+      The Blackfin architecture
diff --git a/patches/uClibc/0.9.30.2/290-blackfin-nommu-fork-stub.patch b/patches/uClibc/0.9.30.2/290-blackfin-nommu-fork-stub.patch
new file mode 100644
index 0000000..7dc0439
--- /dev/null
+++ b/patches/uClibc/0.9.30.2/290-blackfin-nommu-fork-stub.patch
@@ -0,0 +1,32 @@
+From: Jie Zhang <jie.zhang@analog.com>
+Date: Mon, 1 Jun 2009 07:25:42 +0000 (+0000)
+Subject: Backport UCLIBC_HAS_STUBS config option from the upstream. This option makes uClibc... 
+X-Git-Url: http://blackfin.uclinux.org/git/?p=readonly-mirrors%2Ftoolchain.git;a=commitdiff_plain;h=cacea6b12bae6f6cfd08e2bbec536e9b23b342f5
+
+Backport UCLIBC_HAS_STUBS config option from the upstream. This option makes uClibc provide fork() stub on NOMMU targets. It's default off.
+
+
+git-svn-id: svn://localhost/svn/toolchain/trunk@3417 2adf4935-75e9-4407-93b2-34b21a1880a4
+---
+
+Index: uClibc-0.9.30.2/libc/unistd/daemon.c
+===================================================================
+--- uClibc-0.9.30.2.orig/libc/unistd/daemon.c	2010-01-13 22:22:31.000000000 +0100
++++ uClibc-0.9.30.2/libc/unistd/daemon.c	2010-04-06 22:04:11.000000000 +0200
+@@ -55,7 +55,6 @@
+ libc_hidden_proto(dup2)
+ libc_hidden_proto(setsid)
+ libc_hidden_proto(chdir)
+-libc_hidden_proto(fork)
+ 
+ #ifndef __ARCH_USE_MMU__
+ #include <sys/syscall.h>
+@@ -85,6 +84,8 @@
+ 	return ret;
+ }
+ #else
++libc_hidden_proto(fork)
++
+ static inline pid_t fork_parent(void)
+ {
+ 	switch (fork()) {
diff --git a/scripts/build/arch/blackfin.sh b/scripts/build/arch/blackfin.sh
new file mode 100644
index 0000000..e707617
--- /dev/null
+++ b/scripts/build/arch/blackfin.sh
@@ -0,0 +1,14 @@
+# Compute Blackfin-specific values
+
+CT_DoArchTupleValues() {
+    # The architecture part of the tuple:
+    CT_TARGET_ARCH="bfin"
+
+    # gcc ./configure flags
+    CT_ARCH_WITH_ARCH=
+    CT_ARCH_WITH_ABI=
+    CT_ARCH_WITH_CPU=
+    CT_ARCH_WITH_TUNE=
+    CT_ARCH_WITH_FPU=
+    CT_ARCH_WITH_FLOAT=
+}
diff --git a/scripts/build/kernel/linux.sh b/scripts/build/kernel/linux.sh
index 8a568ed..1d08f30 100644
--- a/scripts/build/kernel/linux.sh
+++ b/scripts/build/kernel/linux.sh
@@ -6,7 +6,12 @@ CT_DoKernelTupleValues() {
     if [ "${CT_ARCH_USE_MMU}" = "y" ]; then
         CT_TARGET_KERNEL="linux"
     else
-        CT_TARGET_KERNEL="uclinux"
+    # Sometime, noMMU linux targets have a -uclinux tuple, while
+    # sometime it's -linux. We currently have only one noMMU linux
+    # target, and it uses -linux, so let's just use that. Time
+    # to fix that later...
+    #    CT_TARGET_KERNEL="uclinux"
+        CT_TARGET_KERNEL="linux"
     fi
 }
 
diff --git a/scripts/build/libc/uClibc.sh b/scripts/build/libc/uClibc.sh
index f4aa43d..03411a2 100644
--- a/scripts/build/libc/uClibc.sh
+++ b/scripts/build/libc/uClibc.sh
@@ -190,11 +190,12 @@ mungeuClibcConfig() {
 
     # Hack our target in the config file.
     case "${CT_ARCH}:${CT_ARCH_BITNESS}" in
-        x86:32)     arch=i386;;
-        x86:64)     arch=x86_64;;
-        sh:32)      arch="sh";;
-        sh:64)      arch="sh64";;
-        *)          arch="${CT_ARCH}";;
+        x86:32)      arch=i386;;
+        x86:64)      arch=x86_64;;
+        sh:32)       arch="sh";;
+        sh:64)       arch="sh64";;
+        blackfin:32) arch="bfin";;
+        *)           arch="${CT_ARCH}";;
     esac
     # Also remove stripping: its the responsibility of the
     # firmware builder to strip or not.