vd-rd/sbc_at91sam9260

Open hardware SBC module based on AT91SAM9260 @200MHz with 128MB RAM

Description

The second installment in the embedded Linux hardware development learning exercise. The board is an updated version of the previous AT91RM9200_SBC. Detailed documentation and resources can be found in the docs and resources folders.

Note: the CPU comes in two variants, 208 pin PQFP and 217 pin BGA. The PFQP version is pin compatible with AT91SAM9XE. The BGA version is compatible with the improved AT91SAM9G20 and has its own board.

Features

• CPU - AT91SAM9260 processor (ARM926EJ @ 200MHz)
• RAM - 1Gb SDRAM max ( 3V3 and 1V8 types supported)
• NVM - AT45DB dataflash for U-boot
• microSD card slot
• microUSB client interface
• USB host breakout
• RMII interface for Ethernet
• standard Apollo.IoT expansion header

Resources

You can find all necesary information to build or evaluate the module here:

• View layout and schematic
• View 3D board render
• Fabrication files

Current status and changelog

• v1.1.0 assembled and tested using SAM-BA, AT91Bootstrap, U-Boot and Linux Kernel ported from AT91SAM9260EK and running ok
• v1.1.0 sent to factory, expected to be ready for assembly and testing in mid June.
• 17feb2021 - v1.1.0 assembled. Debug via UART and USB functional.
• 19feb2021 - sam-ba is able to load applets. AT91Bootstrap configured and flashed starting from at91sam9260ekdf_uboot_defconfig
• 21feb2021 - Preliminary uBoot configured and flashed starting from at91sam9260ek_defconfig

sbc_at91sam9260's Issues

Cadlab link broken

Hi!

Just want to mention that https://cadlab.io/project/1695/master/files gives "The integration token for this project has expired. The project owner needs to generate a new token to restore integration."

Please fix this if possible :)

Add testpoint for dataflash invalidation

In order to return to embedded ROMBOOT after dataflash has working bootloader on it, a test-point on the MISO or MOSI lines would be helpful to short that pin to ground and force boot process to fail.
This will allow to reuse SAM-BA to flash new bootloader.

DC-DC outputs lower voltage

The output of the 3.3V buck is 3.2.
The output of the 1.8V buck is 1.62.

Feedback divider values should be adjusted for proper voltage output

Power consumption

Hello

What is the maximum power consumption with all gpio, clock, memory, cpu 100% ....
Best regards
J

[layout] microSD footprint broken

MicroSD footprint has support holes slightly misaligned. Should be rectified.