Add tweaks to use zram for swap and logging, extend README

README.md

@@ -1,11 +1,14 @@
-# WD My Cloud Gen2 aka wdmc-gen2 based on Marvell ARMADA 375 ##
+# build tools for wdmc-gen2
+## WD My Cloud Gen2 based on Marvell ARMADA 375
 
 * mainline kernel support
 	tested with 4.18.x / 5.6.x / 5.10.x
 	- device tree source ./dts/armada-375-wdmc-gen2.dts
 	- kernel config for various kernels included check ./config/
 	- some tweaks and pointers in txt files ./docs/
 	- toolchain for building is included as txz ./toolchain/ you might need to install this 
+	- supports caching of kernel and rootfs so not everything needs to be rebuilt everytime
+	- built rootfs has zram support and uses it for swap and logging
 
 * prerequisites for building 
 	- `apt-get install build-essential bc libncurses5 u-boot-tools git libncurses-dev lib32z1 lib32ncurses5-dev flex bison debootstrap debian-archive-keyring qemu-user-static`
@@ -16,7 +19,7 @@
 		- adjust the path to the gcc in build.sh
 
 * build.sh
-	- New way of building a kernel, rootfs and uRamdisk
+	- provides a way of building a kernel, rootfs and uRamdisk
 	- run build.sh as root (or with sudo)
 	- possible parameters are:
 		- `--release {debianrelease}` to select the debian release to use as rootfs
@@ -28,6 +31,8 @@
 		- `--nokernel` to only build the rootfs + uRamdisk
 		- `--noinitramfs` to build kernel and rootfs without uRamdisk
 		- `--changes` to pause and wait for changes in the rootfs before unmounting and packaging (this allows you to do customization)
+		- `--noclean` to compile kernel without resetting and fetching git
+		- `--noconfig` to skip menuconfig part of kernel
 		- if a parameters is not given, the default value is used. Check in build.sh for default and other usage
 	- if building a rootfs build.sh will include the tweaks from ./tweaks/  You can adjust fstab and various other stuff there
 
@@ -83,4 +88,5 @@
 
 	If you need custom initramfs or different kernel settings, check the code and build neccessary files yourself.
 		
-Thanks to AllesterFox (http://anionix.ddns.net/WDMyCloud/WDMyCloud-Gen2/) and https://github.com/Johns-Q/wdmc-gen2
+Thanks to AllesterFox (http://anionix.ddns.net/WDMyCloud/WDMyCloud-Gen2/) and https://github.com/Johns-Q/wdmc-gen2 for their original work on the wdmc-gen2 
+And to ARMBIAN (https://github.com/armbian/build) for their awesome build script which gave lots of inspiration and the zram config :)

build.sh

@@ -46,7 +46,7 @@ arch='armhf'
 qemu_binary='qemu-arm-static'
 components='main,contrib'
 # Adjust package list here
-includes="ccache,locales,git,ca-certificates,debhelper,rsync,python3,distcc,systemd,init,udev,kmod,busybox,ethtool,dirmngr,hdparm,ifupdown,iproute2,iputils-ping,logrotate,net-tools,nftables,powermgmt-base,procps,rename,resolvconf,rsyslog,ssh,sysstat,update-inetd,isc-dhcp-client,isc-dhcp-common,vim,dialog,apt-utils,nano,keyboard-configuration,console-setup,linux-base,cpio,u-boot-tools" 
+includes="ccache,locales,git,ca-certificates,debhelper,rsync,python3,distcc,systemd,init,udev,kmod,busybox,ethtool,dirmngr,hdparm,ifupdown,iproute2,iputils-ping,logrotate,net-tools,nftables,powermgmt-base,procps,rename,resolvconf,rsyslog,ssh,sysstat,update-inetd,isc-dhcp-client,isc-dhcp-common,vim,dialog,apt-utils,nano,keyboard-configuration,console-setup,linux-base,cpio,u-boot-tools,bc" 
 mirror_addr="http://httpredir.debian.org/debian/"
 
 # Adjust default root pw
@@ -238,7 +238,6 @@ build_root_fs()
 
         echo "### Creating rootfs cache for future builds"
         cat << EOF > "${rootfs_dir}"/root/.debootstrap-info
-#!/bin/bash
 dbs_arch=${arch}
 dbs_release=${release}
 dbs_components=${components}
@@ -291,6 +290,9 @@ EOF
 
     # Setup interfaces (eth0)
     . tweaks/interfaces.sh
+
+    # Add files for zram (swap and logging)
+    . tweaks/zram.sh
 
     if [ ${BUILD_KERNEL} = 'yes' ] 
     then

config/linux-5.10.y.config

@@ -1,6 +1,6 @@
 #
 # Automatically generated file; DO NOT EDIT.
-# Linux/arm 5.10.2 Kernel Configuration
+# Linux/arm 5.10.19 Kernel Configuration
 #
 CONFIG_CC_VERSION_TEXT="arm-none-eabi-gcc (15:7-2018-q2-6) 7.3.1 20180622 (release) [ARM/embedded-7-branch revision 261907]"
 CONFIG_CC_IS_GCC=y
@@ -724,7 +724,8 @@ CONFIG_DEFAULT_MMAP_MIN_ADDR=4096
 # CONFIG_CMA is not set
 # CONFIG_ZPOOL is not set
 # CONFIG_ZBUD is not set
-# CONFIG_ZSMALLOC is not set
+CONFIG_ZSMALLOC=m
+# CONFIG_ZSMALLOC_STAT is not set
 CONFIG_GENERIC_EARLY_IOREMAP=y
 # CONFIG_IDLE_PAGE_TRACKING is not set
 # CONFIG_PERCPU_STATS is not set
@@ -1451,6 +1452,9 @@ CONFIG_ARCH_MIGHT_HAVE_PC_PARPORT=y
 CONFIG_BLK_DEV=y
 # CONFIG_BLK_DEV_NULL_BLK is not set
 # CONFIG_BLK_DEV_PCIESSD_MTIP32XX is not set
+CONFIG_ZRAM=m
+CONFIG_ZRAM_WRITEBACK=y
+CONFIG_ZRAM_MEMORY_TRACKING=y
 # CONFIG_BLK_DEV_UMEM is not set
 CONFIG_BLK_DEV_LOOP=y
 CONFIG_BLK_DEV_LOOP_MIN_COUNT=8
@@ -2501,7 +2505,6 @@ CONFIG_BCMA_POSSIBLE=y
 # CONFIG_MFD_RN5T618 is not set
 # CONFIG_MFD_SEC_CORE is not set
 # CONFIG_MFD_SI476X_CORE is not set
-# CONFIG_MFD_SL28CPLD is not set
 # CONFIG_MFD_SM501 is not set
 # CONFIG_MFD_SKY81452 is not set
 # CONFIG_ABX500_CORE is not set

tweaks/fstab.sh

@@ -6,9 +6,9 @@ cat << EOF > ${rootfs_dir}/etc/fstab
 /dev/sdb1       /boot           auto    defaults                0       0
 
 proc            /proc           proc    defaults                0       0
-#devpts         /dev/pts        devpts  defaults,gid5,mode=620  0       0
+devpts          /dev/pts        devpts  defaults,gid5,mode=620  0       0
 tmpfs           /dev/shm        tmpfs   mode=0777               0       0
-tmpfs           /tmp            tmpfs   mode=1777               0       0
+#tmpfs          /#t#m#p         tmpfs   mode=1777               0       0
 tmpfs           /run            tmpfs   mode=0755,nosuid,nodev  0       0
 sysfs           /sys            sysfs   defaults                0       0