MIPS: ZBOOT: Support XZ compression scheme

Add support for the XZ compression scheme in the ZBOOT decompression
stub, in order to support it we need to:

- select the "xzkern" compression tool to compress the vmlinux.bin
  payload
- link with ashldi3.o for xz_dec_run() to work
- memcpy() is also required for decompress_unxz.c so we share the
  implementation between GZIP and XZ

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Cc: linux-mips@linux-mips.org
Cc: blogic@openwrt.org
Cc: james.hogan@imgtec.com
Patchwork: https://patchwork.linux-mips.org/patch/5818/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index c35603bb6ace..a749defb1582 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -1491,6 +1491,7 @@ config SYS_SUPPORTS_ZBOOT
         select HAVE_KERNEL_BZIP2
         select HAVE_KERNEL_LZMA
         select HAVE_KERNEL_LZO
+        select HAVE_KERNEL_XZ
 
 config SYS_SUPPORTS_ZBOOT_UART16550
         bool