toolchain: enhanced target to only build a minimal kernel

target/toolchain/config.in

@@ -15,7 +15,6 @@
 #Description: Toolchain target
 
 const SDECFG_TRG_TOOLCHAIN ${target:-$SDECFG_TARGET}
-
 for x in OPT=size MULTILIB=0 \
 	LIBC=glibc INIT=runit \
 	; do
@@ -26,7 +25,8 @@ done
 for x in \
 	CCACHE_USEIT=1 \
 	GCC_JAVA=0 GCC_F77=0 GCC_OBJC=0 GCC_GO=0 \
-	DJB_LAYOUT=0 \
+	DJB_LAYOUT=0 LINUX_CONFIG_STYLE='none' \
+	LINUX_CONFIG_FILE="target/$target/linux.cfg" \
 	; do
 
 	export SDECFGSET_PKG_$x

target/toolchain/linux.cfg

@@ -140,10 +140,10 @@ CONFIG_BLK_DEV_INITRD=y
 CONFIG_INITRAMFS_SOURCE=""
 CONFIG_RD_GZIP=y
 CONFIG_RD_BZIP2=y
-# CONFIG_RD_LZMA is not set
-# CONFIG_RD_XZ is not set
-# CONFIG_RD_LZO is not set
-# CONFIG_RD_LZ4 is not set
+CONFIG_RD_LZMA=y
+CONFIG_RD_XZ=y
+CONFIG_RD_LZO=y
+CONFIG_RD_LZ4=y
 # CONFIG_CC_OPTIMIZE_FOR_SIZE is not set
 CONFIG_SYSCTL=y
 CONFIG_ANON_INODES=y
@@ -1939,10 +1939,23 @@ CONFIG_CRC32_SLICEBY8=y
 # CONFIG_AUDIT_ARCH_COMPAT_GENERIC is not set
 # CONFIG_RANDOM32_SELFTEST is not set
 CONFIG_ZLIB_INFLATE=y
-# CONFIG_XZ_DEC is not set
-# CONFIG_XZ_DEC_BCJ is not set
+CONFIG_LZO_DECOMPRESS=y
+CONFIG_LZ4_DECOMPRESS=y
+CONFIG_XZ_DEC=y
+CONFIG_XZ_DEC_X86=y
+CONFIG_XZ_DEC_POWERPC=y
+CONFIG_XZ_DEC_IA64=y
+CONFIG_XZ_DEC_ARM=y
+CONFIG_XZ_DEC_ARMTHUMB=y
+CONFIG_XZ_DEC_SPARC=y
+CONFIG_XZ_DEC_BCJ=y
+# CONFIG_XZ_DEC_TEST is not set
 CONFIG_DECOMPRESS_GZIP=y
 CONFIG_DECOMPRESS_BZIP2=y
+CONFIG_DECOMPRESS_LZMA=y
+CONFIG_DECOMPRESS_XZ=y
+CONFIG_DECOMPRESS_LZO=y
+CONFIG_DECOMPRESS_LZ4=y
 CONFIG_HAS_IOMEM=y
 CONFIG_HAS_IOPORT_MAP=y
 CONFIG_HAS_DMA=y
@@ -1954,4 +1967,3 @@ CONFIG_AVERAGE=y
 # CONFIG_DDR is not set
 CONFIG_ARCH_HAS_SG_CHAIN=y
 
-