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

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

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: 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: 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/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: 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 */

Embedded-linux

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

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

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();