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Release Notes 1.14.2 Print

 

Overview

This is the Linux BSP (Board Support Package) for the Emcraft Systems Kinetis K70/K61 System-On-Module (SOM) Starter Kit.

The BSP provides a software development environment for evaluation and development of Linux (uClinux) on the Cortex-M4 processor core of the Kinetis microcontroller using the Emcraft Systems Kinetis SOM Starter Kit as a hardware platform.

Supported Features

The following list summarizes the features and capabilities of this release of the Kinetis SOM Starter Kit BSP:

  • U-Boot firmware:
    • U-Boot v2010.03;
    • Target initialization from power-on / reset;
    • Runs from the internal eNVM and internal SRAM (no external memory required for standalone operation);
    • Serial console;
    • Ethernet driver for loading images to the target;
    • Serial driver for loading images to the target;
    • Device driver for built-in Flash (eNVM) and self-upgrade capability;
    • Device driver for storing environment and Linux images in external Flash;
    • Autoboot feature, allowing boot of OS images from Flash or other storage with no operator intervention;
    • Persistent environment in Flash for customization of target operation;
    • Sophisticated command interface for maintenance and development of the target.
  • Linux:
    • uClinux kernel v2.6.33;
    • Boot from compressed and uncompressed images;
    • Ability to run critical kernel code from integrated Flash of Kinetis;
    • Serial device driver and Linux console;
    • Ethernet device driver and TCP/IP stack, ping, NFS, Telnet, FTP, NTPD, etc.);
    • busybox v1.17;
    • POSIX pthreads;
    • Hardened exception handling; an exception triggered by a process affects only the offending process;
    • Loadable kernel modules;
    • Support for the hardware FPU;
    • Secure shell (ssh) daemon;
    • Web server;
    • MTD-based Flash partitioning and persistent JFFS2 Flash file system for external Flash;
    • SDHC Card device driver;
    • Framebuffer device driver;
    • Touchscreen device driver;
    • GPIO device driver;
    • RTC device driver;
    • ADC device driver;
    • Device driver for the USB HS host interface;
    • Device driver for the USB FS host interface;
    • Device driver for the SPI interface.
  • Development tools:
    • ARMv7-optimized GNU toolchain from CodeSourcery (2010q1) is used for development of U-Boot, Linux and user-space applications (toolchain must be downloaded separately from the CodeSourcery web site);
    • Cross GDB for debugging user-space applications;
    • mkimage tool used by the Linux kernel build process to create a Linux image bootable by U-Boot.
  • Development environment:
    • Linux-hosted cross-development environment;
    • Development of multiple projects (embedded applications) from a single installation;
    • hello sample project ("Hello, world!" single-process configuration);
    • networking sample project (basic shell, networking, USB, and Flash management tools demonstration);
    • developer sample project (template project that can be used to jump-start development of custom user-space applications and loadable kernel modules).

New and Changed Features

This section lists new and changed features of this release:

  1. Resolve defect: Linux: Marking bad blocks on NAND doesn't work.
    ID: RT 108775.
  2. Resolve defect: U-Boot: Fixed error in NAND driver - ECC soft errors didn't not correct.
    ID: RT 108546.
  3. Support hardware FPU code in pthreaded applications in uClinux on Cortex-M.
    ID: RT 110109.
  4. Add support for low-power mode to the 8081 PHY device driver (put device into the slow oscillator mode).
    ID: RT 112915.

Known Problems & Limitations

This section lists known problems and limitations of this release:

  1. 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.
  2. Enabling CONFIG_USB_EHCI_HCD disables data cache in Linux Kinetis.
    ID: RT 106727
    Workaround: If data cache is required, disable CONFIG_USB_EHCI_HCD and CONFIG_USB_EHCI_MXC in the kernel configuration.
  3. The Emcraft Systems TWR-K70-SOM-BSB Hardware Architecture document
    (twr-k70-som-bsb-ha.pdf) is not included in this release of the product. The document will be made available in the next release.