initial buildroot for linux 5.15

board/qemu/xtensa-lx60/linux-nommu.config

@@ -0,0 +1,39 @@
+CONFIG_NO_HZ_IDLE=y
+CONFIG_HIGH_RES_TIMERS=y
+CONFIG_BLK_DEV_INITRD=y
+CONFIG_XTENSA_VARIANT_CUSTOM=y
+CONFIG_XTENSA_VARIANT_CUSTOM_NAME="dc233c"
+# CONFIG_XTENSA_VARIANT_MMU is not set
+CONFIG_XTENSA_UNALIGNED_USER=y
+CONFIG_PREEMPT=y
+CONFIG_MEMMAP_CACHEATTR=0x2cccccc7
+CONFIG_KERNEL_LOAD_ADDRESS=0x00003000
+# CONFIG_PCI is not set
+CONFIG_XTENSA_PLATFORM_XTFPGA=y
+CONFIG_CMDLINE_BOOL=y
+CONFIG_CMDLINE="earlycon=uart8250,mmio32,0xfd050020,115200n8 console=ttyS0,115200n8 memmap=0x04000000@0"
+CONFIG_DEFAULT_MEM_START=0x00000000
+CONFIG_BINFMT_FLAT=y
+CONFIG_NET=y
+CONFIG_PACKET=y
+CONFIG_UNIX=y
+CONFIG_INET=y
+# CONFIG_IPV6 is not set
+CONFIG_NETFILTER=y
+CONFIG_DNS_RESOLVER=y
+# CONFIG_WIRELESS is not set
+CONFIG_DEVTMPFS=y
+CONFIG_DEVTMPFS_MOUNT=y
+CONFIG_BLK_DEV_LOOP=y
+CONFIG_NETDEVICES=y
+CONFIG_MARVELL_PHY=y
+# CONFIG_WLAN is not set
+CONFIG_SERIAL_8250=y
+# CONFIG_SERIAL_8250_DEPRECATED_OPTIONS is not set
+CONFIG_SERIAL_8250_CONSOLE=y
+# CONFIG_HWMON is not set
+# CONFIG_VGA_CONSOLE is not set
+CONFIG_TMPFS=y
+CONFIG_FANOTIFY=y
+CONFIG_PRINTK_TIME=y
+# CONFIG_S32C1I_SELFTEST is not set

board/qemu/xtensa-lx60/linux.config

@@ -0,0 +1,36 @@
+# CONFIG_SWAP is not set
+# CONFIG_CROSS_MEMORY_ATTACH is not set
+CONFIG_BLK_DEV_INITRD=y
+CONFIG_XTENSA_VARIANT_DC233C=y
+CONFIG_INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX=y
+CONFIG_XTENSA_PLATFORM_XTFPGA=y
+CONFIG_CMDLINE_BOOL=y
+CONFIG_CMDLINE="console=ttyS0,38400 memmap=0x04000000@0"
+# CONFIG_COMPACTION is not set
+# CONFIG_BOUNCE is not set
+# CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS is not set
+CONFIG_NET=y
+CONFIG_PACKET=y
+CONFIG_UNIX=y
+CONFIG_INET=y
+# CONFIG_INET_XFRM_MODE_TRANSPORT is not set
+# CONFIG_INET_XFRM_MODE_TUNNEL is not set
+# CONFIG_INET_XFRM_MODE_BEET is not set
+# CONFIG_INET_LRO is not set
+# CONFIG_INET_DIAG is not set
+# CONFIG_IPV6 is not set
+# CONFIG_WIRELESS is not set
+CONFIG_DEVTMPFS=y
+CONFIG_DEVTMPFS_MOUNT=y
+CONFIG_NETDEVICES=y
+# CONFIG_WLAN is not set
+CONFIG_SERIAL_8250=y
+# CONFIG_SERIAL_8250_DEPRECATED_OPTIONS is not set
+CONFIG_SERIAL_8250_CONSOLE=y
+# CONFIG_HW_RANDOM is not set
+# CONFIG_HWMON is not set
+# CONFIG_VGA_CONSOLE is not set
+CONFIG_TMPFS=y
+CONFIG_TMPFS_POSIX_ACL=y
+CONFIG_LD_NO_RELAX=y
+# CONFIG_S32C1I_SELFTEST is not set

board/qemu/xtensa-lx60/readme.txt

@@ -0,0 +1,7 @@
+Run the emulation with:
+
+ qemu-system-xtensa -M lx60 -cpu dc233c -monitor null -nographic -kernel output/images/Image.elf # qemu_xtensa_lx60_defconfig
+
+ qemu-system-xtensa -M lx60 -cpu dc233c -monitor null -nographic -kernel output/images/Image.elf # qemu_xtensa_lx60_nommu_defconfig
+
+The login prompt will appear in the terminal that started Qemu.