DS60001484 datasheet(31/46 Pages) MICROCHIP

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7.3

NVM Programming

The SAMA5D27 SOM1 is delivered with SAM-BA® In-System Programmer, a comprehensive tool to

program boot memories.

In case the boot code does not find a valid program in NVM, the SAM-BA monitor is launched in order to

program the considered NVM.

The SAM-BA monitor principle is to:

•

Initialize DBGU and USB.

•

Check if USB Device enumeration occurred.

•

Check if characters are received on the DBGU.

Once the communication interface is identified, the application runs in an infinite loop waiting for different

commands.

The firmware can be sent and programmed in the NVM.

For more information, refer to the following link. http://www.at91.com/linux4sam/bin/view/Linux4SAM/

Sama5d2XplainedMainPage#Using_SAM_BA_to_flash_components

7.4

Boot From External Memory

Several types of external memories such as NAND Flash, SDCard, SPI Flash, QSPI Flash, etc. can be

connected to the SAMA5D27 SOM1 and placed on the motherboard.

For details of the Boot sequence, refer to the "NVM Bootloader Program Description for MRL C Parts"

diagram of the SAMA5D2 datasheet, document no. DS60001476.

The table below provides the list of external memory types and interfaces that enable connection to the

SAMA5D27 SOM1:

Table 7-1. External Memory Connections

Memory Type Interface

PIO

Comments

SDCard

SD-MMC0

PA0 to PA13

If external SDMMC0 interface is not used, bit

SDMMC_0 in Boot Configuration Word must

be set to 1.

SD-MMC1

PA18 to PA22, PA27

to PA30

If external SDMMC1 Interface is not used, bit

SDMMC_1 in Boot Configuration Word must

be set to 1.

eMMC

SD-MMC0

PA0 to PA10, PA13

If external SDMMC0 Interface is not used, bit

SDMMC_0 in Boot Configuration Word must

be set to 1.

NAND Flash

NFC

PA0 to PA21, PC11 to

PC31, PD0 to PD8

Field NFC in Boot Configuration Word must

be set to "01". IOSET2 is selected. (See

Notes below)

QSPI Flash

QSPI0

PA0 to PA5

Field QSPI_0 in Boot Configuration Word

must be set to "00". IOSET1 is selected. (See

Notes below)

SAMA5D27 SOM1

Datasheet

DS60001521A-page 31

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