Embedded-linux’s gists

Embedded-linux / debug

Created July 1, 2014 12:34

qemu-debug

	Qemu Running:
	qemu-system-arm -M versatilepb -kernel linux-3.2/arch/arm/boot/zImage -initrd initramfs -append "console=tty1"

	##qemu-system-arm -M versatilepb -m 128M -kernel /home/satishg/qemu/zImage -initrd rootfs.img.gz -append "root=/dev/ram rdinit=/sbin/init"
	versatile-Pb uImage:

	qemu-system-arm -M versatilepb -m 128M -kernel /home/satishg/qemu/vers-uimage/zImage -initrd rootfs.img.gz -append "root=/dev/ram rdinit=/sbin/init"

	For Debug:
	qemu-system-arm -s -S -M versatilepb -m 128M -kernel /home/satishg/qemu/debug-image/zImage -initrd /home/satishg/qemu/debug/busybox-1.17.1/rootfs.img.gz -append "root=/dev/ram rdinit=/sbin/init"

Embedded-linux / objdump

Created June 19, 2014 14:40

Kernel debug-objdump

	Debugging Linux kernel using "objdump"

	To create objdump file include source and symbol address and line numbers.
	/home/satishg/gcc/arm-2010q1/bin/arm-none-linux-gnueabi-objdump -l -S -d vmlinux > vmlinux.asm

	Use System.map file to find base address of function "am3517_evm_init"
	cat System.map \| grep -n am3517_evm_init
	38140:c0623668 t am3517_evm_init

	38140 is line number in System.map.

Embedded-linux / board_am335xevm.c

Last active August 29, 2015 14:02

Kernel-porting[Beaglebone]

	File Name: am335x_evm_board.c



	+MACHINE_START(AM335XEVM, "am335xevm")
	+ /* Maintainer: Texas Instruments */
	+ .atag_offset = 0x100,
	+ .map_io = am335x_evm_map_io,
	+ .init_early = am33xx_init_early,
	+ .init_irq = ti81xx_init_irq,

Embedded-linux / start.S

Last active August 29, 2015 14:02

arm uboot code analysis[versatilePB]

	u-boot/arch/arm/cpu/arm926ejs/start.S

	This file initilizies
	cpu mode,
	interrupts,
	SDRAM, and
	relocate loader code to RAM and
	continue the boot from RAM code.

Embedded-linux / board.c

Created June 10, 2014 11:36

u-boot port [NOR port]

	files changed to add port NOR to u-boot code

	1.arch/arm/cpu/armv7/am33xx/emif4.c
	2.arch/arm/cpu/armv7/am33xx/mem.c
	3.board/ti/am335x/board.c
	4.board/ti/am335x/board.h
	5.board/ti/am335x/mux.c
	6.board/ti/am335x/u-boot.lds
	7.boards.cfg

Embedded-linux / board.c

Created June 10, 2014 11:19

u-boot port [NAND support]

	Files changed for adding NAND support

	1.arch/arm/include/asm/arch-am33xx/mem.h
	2.board/ti/am335x/board.c
	3.board/ti/am335x/board.h
	4.board/ti/am335x/mux.c
	5.include/configs/am335x_evm.h

Embedded-linux / board.c

Created June 10, 2014 11:07

u-boot port [Ethernet support]

	Files chaged to add Ethernet support in u-boot code :

	1.board/ti/am335x/board.c
	2.board/ti/am335x/board.h
	3.board/ti/am335x/mux.c
	4.include/configs/am335x_evm.h

	1.board/ti/am335x/board.c
	+ /* Enable MII pin mux on Beaglebone */
	+ enable_mii1_pin_mux();

Embedded-linux / board.c

Created June 10, 2014 10:59

MMC Port to uboot

	Files chaged to add MMC support in u-boot code :

	1.board/ti/am335x/board.c
	2.board/ti/am335x/board.h
	3.board/ti/am335x/mux.c
	4.include/configs/am335x_evm.h

	1.board/ti/am335x/board.c

	+ /* Enable pin mux for mmc0 */

Embedded-linux / Template file: 8

Created June 10, 2014 07:49

u-boot porting

	File name: boards.cfg

	File provides Target , Arch.name, CPU, Board name, vendor name, SoC name adn optios to boot.

	# Target ARCH CPU Board name Vendor SoC Options
	am335x_evm arm armv7 am335x ti am33xx am335x_evm:SERIAL1,CONS_INDEX=1
	am335x_evm_usbspl arm armv7 am335x ti am33xx am335x_evm:SERIAL1,CONS_INDEX=1,SPL_USBETH_SUPPORT
	am335x_evm_spiboot arm armv7 am335x ti am33xx am335x_evm:SERIAL1,CONS_INDEX=1,SPI_BOOT
	am335x_evm_uart1 arm armv7 am335x ti am33xx am335x_evm:SERIAL2,CONS_INDEX=2
	am335x_evm_uart2 arm armv7 am335x ti am33xx am335x_evm:SERIAL3,CONS_INDEX=3

Embedded-linux / Template file :7

Created June 10, 2014 07:36

u-boot porting

	File Name: include/configs/am335x_evm.h

	This file talks about different configurations of System parametrs
	-> DMA size,
	#define CONFIG_DMA_COHERENT_SIZE (1 << 20)
	->system Malloc len
	#define CONFIG_SYS_MALLOC_LEN (1024 << 10)

	->Machine type and number to pass to atag list[for identification of Machine]
	#define MACH_TYPE_TIAM335EVM 3589 /* Until the next sync */

G Satish Kumar Embedded-linux