[openwrt/openwrt] ath79: add low_mem to tiny image

[LEDE Commits]

hauke pushed a commit to openwrt/openwrt.git, branch openwrt-22.03:
https://git.openwrt.org/f579b8538b72ed4ea9b53e7ed1cffe651e90ffeb

commit f579b8538b72ed4ea9b53e7ed1cffe651e90ffeb
Author: Nick Hainke <vincent at systemli.org>
AuthorDate: Fri Aug 19 18:59:36 2022 +0200

    ath79: add low_mem to tiny image
    
    Devices with SMALL_FLASH enabled have "SQUASHFS_BLOCK_SIZE=1024" in
    their config. This significantly increases the cache memory required by
    squashfs [0]. This commit enables low_mem leading to a much better
    performance because the SQUASHFS_BLOCK_SIZE is reduced to 256.
    
    Example Nanostation M5 (XM):
    The image size increases by 128 KiB. However, the memory statisitcs look
    much better:
    
    Default tiny build:
    ------
    MemTotal:          26020 kB
    MemFree:            5648 kB
    MemAvailable:       6112 kB
    Buffers:               0 kB
    Cached:             3044 kB
    
    low_mem enabled:
    -----
    MemTotal:          26976 kB
    MemFree:            6748 kB
    MemAvailable:      11504 kB
    Buffers:               0 kB
    Cached:             7204 kB
    
    [0] - https://github.com/freifunk-gluon/gluon/commit/7e8af99cf504ca1dc389f282a0c94f4a911571be
    
    Signed-off-by: Nick Hainke <vincent at systemli.org>
    (cherry picked from commit f54ac98f8cec676761e5144ae06640b8007b4b04)
---
 target/linux/ath79/tiny/target.mk | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/target/linux/ath79/tiny/target.mk b/target/linux/ath79/tiny/target.mk
index 91f135b56e..28e02f7a67 100644
--- a/target/linux/ath79/tiny/target.mk
+++ b/target/linux/ath79/tiny/target.mk
@@ -1,5 +1,5 @@
 BOARDNAME:=Devices with small flash
-FEATURES += small_flash
+FEATURES += low_mem small_flash
 
 DEFAULT_PACKAGES += wpad-basic-wolfssl