Embedded-linux

File Name: board/ti/am335x/u-boot.lds

-> This file talks about text, data sections of image file like
.text, 
.data,
.rodata,
.bss,
.dynsym [Dynamic symbols] etc..

    . = 0x00000000;

Embedded-linux

File Name: board/ti/am335x/mux.c

-> This file do pin muxing of uart0 to uart5, I2C0 & I2C1, MMC0 & MMC1, NAND muxing.


static struct module_pin_mux uart1_pin_mux[] = {
        {OFFSET(uart1_rxd), (MODE(0) | PULLUP_EN | RXACTIVE)},  /* UART1_RXD */
        {OFFSET(uart1_txd), (MODE(0) | PULLUDEN)},              /* UART1_TXD */
        {-1},
};

Embedded-linux

File Name: board/ti/am335x/board.c

TPS65217 is chip which supplies power to Am335x.

Adding fatures of TPS65217 IC 

The TPS65217 is an optimized and highly integrated power management solution for the AM335x
processor. Features of the TPS65217 include:
• Power path management for Lithium-ion battery, USB, and AC inputs
• Linear Battery Charger

Embedded-linux

file name: arch/arm/cpu/armv7/am33xx/mem.c


void gpmc_init(void)
{
        /* putting a blanket check on GPMC based on ZeBu for now */
        gpmc_cfg = (struct gpmc *)GPMC_BASE;

#if defined(CONFIG_CMD_NAND)
        const u32 *gpmc_config = NULL;

Embedded-linux

File Name: arch/arm/cpu/armv7/am33xx/emif4.c


int dram_init(void)
{
        /* dram_init must store complete ramsize in gd->ram_size */
        gd->ram_size = get_ram_size(
                        (void *)CONFIG_SYS_SDRAM_BASE,
                        CONFIG_MAX_RAM_BANK_SIZE);
        return 0;

Embedded-linux

Template files presented before porting MMC/SD, Ethernet, NAND & NOR.

1.arch/arm/cpu/armv7/am33xx/board.c
2.arch/arm/cpu/armv7/am33xx/emif4.c
3.arch/arm/cpu/armv7/am33xx/mem.c
4.board/ti/am33xx/board.c
5.board/ti/am33xx/mux.c
6.board/ti/am33xx/uboot.lds
7.boards.cfg
8.include /configs/am335x_evm.h

Embedded-linux

The OS functions supported at kernel level are, of course, only those functions programmed inside it:

kmalloc(), kfree(): memory management

cli(), sti(): enable/disable interrupts

add_timer(), init_timer(), del_timer(): timing management

request_irq(), free_irq(): irq management

Embedded-linux

Writing I2C Platform Driver and Code Flow:

File Name: arch/arm/mach-versatile/versatile-pb.c

Function Name: versatile_init(); -----------> arch/arm/mach-versatile/core.c --------------> 
                                      platform_device_register(&versatile_i2c_device);
                                      
                                      
                                      
Machine File is registering i2c device with function name platform_device_register()

Embedded-linux

Template Files : arch/arm/cpu/armv7/am33xx/board.c
                 arch/arm/cpu/armv7/am33xx/emif4.c
                 arch/arm/cpu/armv7/am33xx/mem.c
                 board/ti/am335x/board.c
                 board/ti/am335x/mux.c
                 board/ti/am335x/uboot.lds
                 boards.cfg
                 include/configs/am335x_evm.h
                 

Embedded-linux

Files to change: arch/arm/board-am335xevm.c

-------------------------------------------------------------------------
+#include <linux/input/ti_tsc.h>
+#include <linux/mfd/ti_tscadc.h>
-------------------------------------------------------------------------
Header files incluing for structure ti_tsc variables and 
register offset values of the device "TFC_S9700RTWV35TR_01B"  

-------------------------------------------------------------------------