I upgraded the flash to 16MB and am trying to get this working looks like from old patches on another site there is some mention of changing the parititon maps:
diff --git a/target/linux/ar71xx/image/Makefile b/target/linux/ar71xx/image/Makefile
index 1f181f4..b45642a 100644
--- a/target/linux/ar71xx/image/Makefile
+++ b/target/linux/ar71xx/image/Makefile
@@ -213,7 +213,7 @@ ap136_mtdlayout=mtdparts=spi0.0:256k(u-boot)ro,64k(u-boot-env)ro,6336k(rootfs),1
bxu2000n2_mtdlayout=mtdparts=spi0.0:256k(u-boot)ro,64k(u-boot-env)ro,1408k(kernel),8448k(rootfs),6016k(user),64k(cfg),64k(oem),64k(art)ro
cameo_ap81_mtdlayout=mtdparts=spi0.0:128k(u-boot)ro,64k(config)ro,3840k(firmware),64k(art)ro
cameo_ap91_mtdlayout=mtdparts=spi0.0:192k(u-boot)ro,64k(nvram)ro,3712k(firmware),64k(mac)ro,64k(art)ro
-cameo_ap99_mtdlayout=mtdparts=spi0.0:192k(u-boot)ro,64k(nvram)ro,3520k(firmware),64k(mac)ro,192k(lp)ro,64k(art)ro
+cameo_ap99_mtdlayout=mtdparts=spi0.0:256k(u-boot)ro,64k(u-boot-env)ro,15744k(firmware),64k(mac)ro,192k(lp)ro,64k(art)ro
cameo_ap121_mtdlayout=mtdparts=spi0.0:64k(u-boot)ro,64k(art)ro,64k(mac)ro,64k(nvram)ro,192k(language)ro,3648k(firmware)
cameo_ap121_mtdlayout_8M=mtdparts=spi0.0:64k(u-boot)ro,64k(art)ro,64k(mac)ro,64k(nvram)ro,256k(language)ro,7680k@0x80000(firmware)
cameo_db120_mtdlayout=mtdparts=spi0.0:64k(uboot)ro,64k(nvram)ro,15936k(firmware),192k(lang)ro,64k(mac)ro,64k(art)ro
@@ -376,7 +376,7 @@ Image/Build/CameoAP91/buildkernel=$(call MkuImageLzma,$(2),$(3) $(cameo_ap91_mtd
Image/Build/CameoAP91=$(call Image/Build/Cameo,$(1),$(2),$(3),$(cameo_ap91_mtdlayout),$(4),65536)
Image/Build/CameoAP91/initramfs=$(call MkuImageLzma/initramfs,$(2),$(3) $(cameo_ap91_mtdlayout))
-Image/Build/CameoAP99/buildkernel=$(call MkuImageLzma,$(2),$(3) $(cameo_ap99_mtdlayout))
+Image/Build/CameoAP99/buildkernel=$(call MkuImageGzip,$(2),$(3) $(cameo_ap99_mtdlayout))
Image/Build/CameoAP99=$(call Image/Build/Cameo,$(1),$(2),$(3),$(cameo_ap99_mtdlayout),$(4),65536)
Image/Build/CameoAP99/initramfs=$(call MkuImageLzma/initramfs,$(2),$(3) $(cameo_ap99_mtdlayout))
anyone get lede working on dir 615 with 16MB flash?