Added jessie 4.1.7 kernel, tools for building kernel and modified REA…

…DME.md

README.md

@@ -1,10 +1,18 @@
 # qemu-rpi-kernel
 Qemu kernel for emulating Rpi on QEMU
 
-While I was searching the internet about emulating QEMU, most of the guides pointed to link https://xecdesign.com/downloads/linux-qemu/kernel-qemu which is dead as of now. 
+While I was searching the internet about emulating QEMU, most of the guides pointed to link https://xecdesign.com/downloads/linux-qemu/kernel-qemu which is dead as of now.
 So making it available on github for someone who would like to use it.
 Hope it helps.
 
-Please note that this kernel has been tested against wheezy image of raspbian but it doesn't work with newer jessie raspbian images. 
+This repo contains two kernels.
+
+kernel-qemu-3.10.25-wheezy, which is the original kernel from link https://xecdesign.com/downloads/linux-qemu/kernel-qemu - Works fine with any wheezy image with changes mentioned in wiki.
+
+kernel-qemu-4.1.7-jessie, which is newer kernel compiled compatible with jessie as well as it works well with older wheezy images, build scripts are in tools folder for reference.
+
+Known issues:
+
+1. kernel-qemu-4.1.7-jessie doesn't seem to work properly with 2014-09-24 jessie image as it sends to emergency mode after making standard changes in .img file. Feel free to contribute to wiki / create a PR if you have found a work around for this issue.
 
 Go through wiki page for step by step guide how to emulate raspberry pi on Qemu on any platform (Win, linux or Mac Os)

tools/README.md

@@ -0,0 +1,20 @@
+In this subsection, I've included tools for who want to build kernel themselves.
+
+build-kernel-qemu script helps one to automate kernel building process for any debian based distro.
+
+For other OSes, like windows and Mac OS X, you can have a similar tools like gcc-arm-linux-gnueabihf and more and follow
+build-kernel-qemu line by line to build kernel yourself.
+
+Please note that build-kernel-qemu is not an original work of mine and credit for it goes to original author.
+
+I've taken building references from the links below:
+
+https://web.archive.org/web/20131210001638/http://xecdesign.com/compiling-a-kernel/
+https://web.archive.org/web/20131209235952/http://xecdesign.com/compiling-qemu/
+https://web.archive.org/web/20131210001407/http://xecdesign.com/working-with-qemu/
+https://web.archive.org/web/20131210001526/http://xecdesign.com/qemu-emulating-raspberry-pi-the-easy-way/
+
+build-kernel-qemu references :
+
+https://github.com/johnlane/rpi-utils/blob/master/kernel/build-kernel-qemu
+https://github.com/polaco1782/raspberry-qemu/blob/master/build-kernel-qemu

tools/build-kernel-qemu

@@ -0,0 +1,46 @@
+#!/bin/bash
+#
+# Build ARM kernel 4.1.7 for QEMU Raspberry Pi Emulation
+#
+#######################################################
+
+TOOLCHAIN=arm-linux-gnueabihf
+
+sudo apt-get update && sudo apt-get install git libncurses5-dev gcc-arm-linux-gnueabihf
+git clone https://github.com/raspberrypi/linux.git
+cd linux
+#checking out 4.1.7+ branch - change it if you want to change kernel version
+# for kernel specific hash, have a looks at : https://github.com/raspberrypi/linux/commits/rpi-4.1.y
+git checkout 77798915750db46f10bb449e1625d6368ea42e25
+make ARCH=arm versatile_defconfig
+cat >> .config << EOF
+CONFIG_CROSS_COMPILE="$TOOLCHAIN"
+CONFIG_CPU_V6=y
+CONFIG_ARM_ERRATA_411920=y
+CONFIG_ARM_ERRATA_364296=y
+CONFIG_AEABI=y
+CONFIG_OABI_COMPAT=y
+CONFIG_PCI=y
+CONFIG_SCSI=y
+CONFIG_SCSI_SYM53C8XX_2=y
+CONFIG_BLK_DEV_SD=y
+CONFIG_BLK_DEV_SR=y
+CONFIG_DEVTMPFS=y
+CONFIG_DEVTMPFS_MOUNT=y
+CONFIG_TMPFS=y
+CONFIG_INPUT_EVDEV=y
+CONFIG_EXT3_FS=y
+CONFIG_EXT4_FS=y
+CONFIG_VFAT_FS=y
+CONFIG_NLS_CODEPAGE_437=y
+CONFIG_NLS_ISO8859_1=y
+CONFIG_FONT_8x16=y
+CONFIG_LOGO=y
+CONFIG_VFP=y
+CONFIG_CGROUPS=y
+EOF
+
+make -j 4 -k ARCH=arm CROSS_COMPILE=${TOOLCHAIN}- menuconfig
+make -j 4 -k ARCH=arm CROSS_COMPILE=${TOOLCHAIN}-
+cd ..
+cp linux/arch/arm/boot/zImage kernel-qemu

tools/linux-arm.patch

@@ -0,0 +1,66 @@
+diff -rupN linux/arch/arm/mach-versatile/Kconfig linux.b/arch/arm/mach-versatile/Kconfig
+--- linux/arch/arm/mach-versatile/Kconfig	2015-10-12 20:42:55.161811668 -0300
++++ linux.b/arch/arm/mach-versatile/Kconfig	2015-10-12 16:12:43.125862874 -0300
+@@ -4,7 +4,6 @@ menu "Versatile platform type"
+ config ARCH_VERSATILE_PB
+ 	bool "Support Versatile Platform Baseboard for ARM926EJ-S"
+ 	default y
+-	select CPU_ARM926T
+ 	select MIGHT_HAVE_PCI
+ 	help
+ 	  Include support for the ARM(R) Versatile Platform Baseboard
+@@ -12,7 +11,6 @@ config ARCH_VERSATILE_PB
+
+ config MACH_VERSATILE_AB
+ 	bool "Support Versatile Application Baseboard for ARM926EJ-S"
+-	select CPU_ARM926T
+ 	help
+ 	  Include support for the ARM(R) Versatile Application Baseboard
+ 	  for the ARM926EJ-S.
+diff -rupN linux/arch/arm/mm/Kconfig linux.b/arch/arm/mm/Kconfig
+--- linux/arch/arm/mm/Kconfig	2015-10-12 20:42:55.165811668 -0300
++++ linux.b/arch/arm/mm/Kconfig	2015-10-12 16:14:36.525859523 -0300
+@@ -71,7 +71,7 @@ config CPU_ARM9TDMI
+
+ # ARM920T
+ config CPU_ARM920T
+-	bool "Support ARM920T processor" if (ARCH_MULTI_V4T && ARCH_INTEGRATOR)
++	bool "Support ARM920T processor" if ARCH_INTEGRATOR || ARCH_VERSATILE_PB || ARCH_VERSATILE_AB
+ 	select CPU_32v4T
+ 	select CPU_ABRT_EV4T
+ 	select CPU_CACHE_V4WT
+@@ -89,7 +89,7 @@ config CPU_ARM920T
+
+ # ARM922T
+ config CPU_ARM922T
+-	bool "Support ARM922T processor" if (ARCH_MULTI_V4T && ARCH_INTEGRATOR)
++	bool "Support ARM922T processor" if ARCH_INTEGRATOR || ARCH_VERSATILE_PB || ARCH_VERSATILE_AB
+ 	select CPU_32v4T
+ 	select CPU_ABRT_EV4T
+ 	select CPU_CACHE_V4WT
+@@ -127,7 +127,7 @@ config CPU_ARM925T
+
+ # ARM926T
+ config CPU_ARM926T
+-	bool "Support ARM926T processor" if (!ARCH_MULTIPLATFORM || ARCH_MULTI_V5) && (ARCH_INTEGRATOR || MACH_REALVIEW_EB)
++	bool "Support ARM926T processor" if ARCH_INTEGRATOR || MACH_REALVIEW_EB || ARCH_VERSATILE_PB || ARCH_VERSATILE_AB
+ 	select CPU_32v5
+ 	select CPU_ABRT_EV5TJ
+ 	select CPU_CACHE_VIVT
+@@ -135,6 +135,7 @@ config CPU_ARM926T
+ 	select CPU_CP15_MMU
+ 	select CPU_PABRT_LEGACY
+ 	select CPU_TLB_V4WBI if MMU
++	depends on !CPU_V6 && !CPU_V7
+ 	help
+ 	  This is a variant of the ARM920.  It has slightly different
+ 	  instruction sequences for cache and TLB operations.  Curiously,
+@@ -358,7 +359,7 @@ config CPU_PJ4B
+
+ # ARMv6
+ config CPU_V6
+-	bool "Support ARM V6 processor" if (!ARCH_MULTIPLATFORM || ARCH_MULTI_V6) && (ARCH_INTEGRATOR || MACH_REALVIEW_EB || MACH_REALVIEW_PBX)
++	bool "Support ARM V6 processor" if ARCH_INTEGRATOR || MACH_REALVIEW_EB || MACH_REALVIEW_PBX || MACH_BCM2708 || ARCH_VERSATILE_PB || ARCH_VERSATILE_AB
+ 	select CPU_32v6
+ 	select CPU_ABRT_EV6
+ 	select CPU_CACHE_V6