config: extend small_flash feature

Extend the small_flash feature to disable swap, core dumps, and
kernel debug info, and change the squashfs block size to 1024KiB.

Also change squashfs fragment cache to 2 for small_flash to ease memory
usage.

Signed-off-by: Alex Maclean <monkeh@monkeh.net>

config/Config-images.in

@@ -149,6 +149,7 @@ menu "Target Images"
 			int "Block size (in KiB)"
 			depends on TARGET_ROOTFS_SQUASHFS
 			default 64 if LOW_MEMORY_FOOTPRINT
+			default 1024 if (SMALL_FLASH && !LOW_MEMORY_FOOTPRINT)
 			default 256
 
 	menuconfig TARGET_ROOTFS_UBIFS

config/Config-kernel.in

@@ -31,7 +31,7 @@ config KERNEL_CRASHLOG
 
 config KERNEL_SWAP
 	bool "Support for paging of anonymous memory (swap)"
-	default y
+	default y if !SMALL_FLASH
 
 config KERNEL_DEBUG_FS
 	bool "Compile the kernel with debug filesystem enabled"
@@ -133,7 +133,7 @@ config KERNEL_DEBUG_KERNEL
 
 config KERNEL_DEBUG_INFO
 	bool "Compile the kernel with debug information"
-	default y
+	default y if !SMALL_FLASH
 	select KERNEL_DEBUG_KERNEL
 	help
 	  This will compile your kernel and modules with debug information.
@@ -226,7 +226,7 @@ config KERNEL_COREDUMP
 config KERNEL_ELF_CORE
 	bool "Enable process core dump support"
 	select KERNEL_COREDUMP
-	default y
+	default y if !SMALL_FLASH
 
 config KERNEL_PROVE_LOCKING
 	bool "Enable kernel lock checking"
@@ -807,6 +807,11 @@ config KERNEL_DEVKMEM
 	  /dev/kmem device is rarely used, but can be used for certain
 	  kind of kernel debugging operations.
 
+config KERNEL_SQUASHFS_FRAGMENT_CACHE_SIZE
+	int "Number of squashfs fragments cached"
+	default 2 if (SMALL_FLASH && !LOW_MEMORY_FOOTPRINT)
+	default 3
+
 #
 # compile optimiziation setting
 #

target/linux/generic/config-3.18

@@ -3816,7 +3816,7 @@ CONFIG_SQUASHFS=y
 # CONFIG_SQUASHFS_DECOMP_MULTI is not set
 CONFIG_SQUASHFS_DECOMP_MULTI_PERCPU=y
 # CONFIG_SQUASHFS_DECOMP_SINGLE is not set
-# CONFIG_SQUASHFS_EMBEDDED is not set
+CONFIG_SQUASHFS_EMBEDDED=y
 # CONFIG_SQUASHFS_FILE_CACHE is not set
 CONFIG_SQUASHFS_FILE_DIRECT=y
 CONFIG_SQUASHFS_FRAGMENT_CACHE_SIZE=3

target/linux/generic/config-4.14

@@ -4683,7 +4683,7 @@ CONFIG_SQUASHFS=y
 # CONFIG_SQUASHFS_DECOMP_MULTI is not set
 CONFIG_SQUASHFS_DECOMP_MULTI_PERCPU=y
 # CONFIG_SQUASHFS_DECOMP_SINGLE is not set
-# CONFIG_SQUASHFS_EMBEDDED is not set
+CONFIG_SQUASHFS_EMBEDDED=y
 # CONFIG_SQUASHFS_FILE_CACHE is not set
 CONFIG_SQUASHFS_FILE_DIRECT=y
 CONFIG_SQUASHFS_FRAGMENT_CACHE_SIZE=3

target/linux/generic/config-4.9

@@ -4401,7 +4401,7 @@ CONFIG_SQUASHFS=y
 # CONFIG_SQUASHFS_DECOMP_MULTI is not set
 CONFIG_SQUASHFS_DECOMP_MULTI_PERCPU=y
 # CONFIG_SQUASHFS_DECOMP_SINGLE is not set
-# CONFIG_SQUASHFS_EMBEDDED is not set
+CONFIG_SQUASHFS_EMBEDDED=y
 # CONFIG_SQUASHFS_FILE_CACHE is not set
 CONFIG_SQUASHFS_FILE_DIRECT=y
 CONFIG_SQUASHFS_FRAGMENT_CACHE_SIZE=3