The tinyconfig target from top-level Makefile has already enabled some
common options, but they are not enough to enable boot and print.

    $ find kernel/ arch/*/ -name "tiny*.config"
    kernel/configs/tiny-base.config
    kernel/configs/tiny.config
    arch/x86/configs/tiny.config

To enable qemu boot and console print, additional kernel config options
are required, include the common parts and the architecture specific
parts.

Here adds minimal extra common parts for all architectures:

* for initrd: CONFIG_BLK_DEV_INITRD
* for init executable: CONFIG_BINFMT_ELF
* for test result print: CONFIG_PRINTK, CONFIG_TTY

Signed-off-by: Zhangjin Wu <falcon@tinylab.org>
---
 tools/testing/selftests/nolibc/configs/common.config | 4 ++++
 1 file changed, 4 insertions(+)
 create mode 100644 tools/testing/selftests/nolibc/configs/common.config

diff --git a/tools/testing/selftests/nolibc/configs/common.config b/tools/testing/selftests/nolibc/configs/common.config
new file mode 100644
index 000000000000..3957f812faac
--- /dev/null
+++ b/tools/testing/selftests/nolibc/configs/common.config
@@ -0,0 +1,4 @@
+CONFIG_BLK_DEV_INITRD=y
+CONFIG_BINFMT_ELF=y
+CONFIG_PRINTK=y
+CONFIG_TTY=y
-- 
2.25.1