User Guide

Emcraft Systems
3.3. Known Problems & Limitations
This section lists known problems and limitations of this release:
1. USB is not supported by this release on the M2S050-FG484 SOM since the USB ULPI
interface is not supported on the M2S050-FG484 ES and PP (pre-production) devices.
2. CONFIG_KERNEL_IN_ENVM requires disabling CONFIG_ARM_UNWIND
and CONFIG_EARLY_PRINTK.
ID: RT 74683.
Workaround: When enabling CONFIG_KERNEL_IN_ENVM in the kernel, disable
CONFIG_ARM_UNWIND and CONFIG_EARLY_PRINTK.
3. Debugging of multi-threaded applications using GDB is not supported.
ID: RT 77243.
Workaround: None. This issue will be resolved in future releases of the product.
4. USB hot plug doesn't work on SmarFusion2 under uClinux.
ID: RT 82415.
Workaround: Limitation will be fixed in next release.
4. Hardware Setup
This section explains how to set up the Emcraft Systems M2S-FG484 SOM board in harness
with the Emcraft Systems SOM-BSB-EXT baseboard.
4.1. Hardware Interfaces
The M2S-FG484 SOM board in harness with the Emcraft Systems SOM-BSB-EXT baseboard
provides the following components and interfaces:
M2S-FG484
M2S-FG484
SOM
Breadboard area
ARM JTAG interface
USB Power &
UART interface
64 MB LPDDR
Reset button
16 MB SPI Flash
User button
Ethernet PHY
USB OTG interface
ULPI USB PHY
FlashPro interface
Ethernet
interface
JP2:
1
–2 open,
3
–4 closed
FlashPro interface
Linux SmartFusion2 6/11 Release 1.12.0
Emcraft Systems M2S-FG484 SOM Starter Kit Guide