Omapl137/DA830 linux bootup

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This page is intended to describe the OMAPL137/DA830 EVM boot sequence and several additional details required to reflash the built-in SPI Flash memory.

On the OMAP-L137/DA830 SoC, the DSP boots first
- ARM remains disabled at reset.
The device supports booting from various media.
- On the EVM, booting from SPI flash is supported.
The DSP User Boot Loader (UBL) comes up first.
- resides at start of SPI flash
- is in Application Image Script (AIS) file format
- loads the ARM UBL to internal RAM, sets up ARM reset vector and enables ARM.
- Typically there should be no need to modify this software
The ARM UBL comes up next
- resides next to DSP UBL in SPI flash
- is in flat-binary file format
- Sets up PLLs, SDRAM and does other basic initialization
- Copies U-Boot to SDRAM and starts it.
U-Boot
- De-facto boot loader for ARM Linux
- resides in SPI flash after ARM UBL
- is in flat-binary file format
- Supported version is 1.3.3

Obtaining Software

Need:
- Boot Utils (part of PSP package)
- MontaVista tools
- Code Composer Studio v3.3 (Code Composer Studio v4 for the DA830)
Obtaining Boot Utils - Use either of:
- Standalone PSP package for DA830/OMAP-L137 from https://www-a.ti.com/downloads/sds_support/targetcontent/psp/mv_lsp_2_20/index.html
- PSP package part of OMAP-L137 Software Development Kit obtainable from: http://focus.ti.com/dsp/docs/dspcontent.tsp?contentId=51607&DCMP=OMAP-LxProcessors+Other&HQS=Other+OT+omapl137sksoftwareea
Obtaining MontaVista tools
- Demonstration version of tools included with the OMAP-L137 starter kit.
- MontaVista tools obtainable from MVZone support.mvista.com
Obtaining Code Composer Studio
- CCStudio CD included with OMAP-L137 starter kit.
- Visit: www.ti.com/ccstudio

Flashing the EVM

Setup CCStudio on Host PC using CCS Config files and GEL files here: http://support.spectrumdigital.com/boards/evmomapl137/revd/
Setup the EVM in "emulation debug" mode by setting SW2 switch as follows:

Pin #	7	2	1	0	3
Position	1	1	1	1	0

On EVM revisions A and B, the SW2 switch for Pin #3 is inverted. That is, OFF = 1 and ON = 0. This problem has been corrected from EVM revision C onwards.

Power-up the EVM and connect the on-board emulation to the PC using the supplied USB cable
Start CCStudio, connect to DSP, then to ARM
From the ARM window, load spiflash_writer.out
When prompted for filetype, enter dspais =armubl= or u-boot.bin depending on whether you are burning the DSP UBL, the ARM UBL, or U-Boot respectively
All three files need to be burnt to SPI flash for successful boot-up
Disconnect CCStudio and Power-off EVM, and setup it to boot from SPI0 Flash

Pin #	7	2	1	0	3
Position	0	1	0	1	X

Connect NULL modem cable from DB9 connector on EVM to COM port on PC
Setup the serial terminal for 115200 baud, 8 bit data, no parity, 1 stop-bit and no flow control
Power up the EVM and you should see the U-Boot prompt on the serial console.

Booting Linux

Boot from SPI flash
- SPI flash is 4MBytes on EVM board
- Use SPI flash to store kernel, use SDRAM, NFS, MMC/SD etc for storing FS
  - Select the serial flash device sf probe 0
  - Download uImage and copy it to SPI flash partition

tftp 0xc0700000 uImage
sf erase 0x1E0000 0x220000
sf write 0xc0700000 0x1E0000 0x220000

- - Download ramdisk.gz to SDRAM. tftp 0xc1180000 ramdisk.gz
  - Setup bootargs to boot with this configuration

setenv bootargs 'mem=32M console=ttyS2,115200n8 root=/dev/ram0 rw initrd=0xc1180000,4M ip=dhcp'
setenv bootcmd 'sf probe 0;sf read 0xc0700000 0x1E0000 0x220000; bootm 0xc0700000'

Compiling Software

Optional if using pre-compiled binaries from bin directory of PSP package
To compile SPI flash writer:
- open board_utils/flash_writers/spi_flash_writer/ccsv3.3/spiflash_writer.pjt in CCStudio v3.3
- Build the Project like any other CCStudio project
- spiflash_writer.out is placed in the Debug directory
Re-compiling DSP UBL should typically not be needed. If required, refer to "Additional Procedures" section of PSP User's Guide.
To compile ARM UBL
- open board_utils/armubl/ubl.pjt in CCStudio v3.3
- Build the Project like any other CCStudio project
- ubl-spi.bin file is placed in the board_utils/armubl directory
To compile U-Boot:
- untar board_utils/u-boot-1.3.3.tar.gz
- Make sure MontaVista tools are in $PATH
- change to u-boot-1.3.3 directory and issue:

make distclean
make da830_omapl137_config
make

- u-boot.bin in created in top level directory
To compile Linux:
- install mvl_5_0_0_demo_lsp_setuplinux_02_20_X_X.bin; untar the kernel.
- change to linux-2.6.18_pro500 directory and issue:

make distclean ARCH=arm CROSS_COMPILE=arm_v5t_le
make da830_omapl137_defconfig ARCH=arm CROSS_COMPILE=arm_v5t_le
make uImage ARCH=arm CROSS_COMPILE=arm_v5t_le-

- uImage in created in arch/arm/boot directory

Recording of the Presentations

Streaming WebEx recording of OMAPL1 Linux Boot Up Driver

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