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OMAP-L1x FAQ

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This FAQ applies to the following devices unless indicated otherwise: OMAP-L138, OMAP-L137, OMAP-L132, C6748/6746/6742, C6747/6745, AM1810/1808/1806/1802 and AM1707/1705

Hardware Features & Configuration

System Interconnect

LCD Controller

Software Setup & Boot

Linux u-Boot

u-boot environment example

bootdelay=3
baudrate=115200
bootfile="uImage"
ethaddr=00:0e:99:##:##:##        
gateway=192.168.1.1
getkernel_tftp=tftpboot 0xC0700000 uImage
bootargs_nfs=mem=32M console=ttyS2,115200n8 root=/dev/nfs nfsroot=192.168.1.2:/home/user/workdir/filesys,nolock rw noinitrd ip=dhcp
bootcmd_nfs=run getkernel_tftp; bootm 0xC0700000
bootargs_sd=mem=32M console=ttyS2,115200n8 root=/dev/mmcblk0p2 rw noinitrd ip=dhcp
ipaddr=192.168.1.15
serverip=192.168.1.2
getkernel_spi=sf probe 0;sf read 0xc0700000 0x1e0000 0x220000
bootcmd_spi=run getkernel_spi; bootm 0xc0700000
bootargs=mem=32M console=ttyS2,115200n8 root=/dev/mmcblk0p2 rw noinitrd ip=dhcp
bootcmd=run getkernel_spi; bootm 0xc0700000
stdin=serial
stdout=serial
stderr=serial
ver=U-Boot 1.3.3 (Feb  5 2009 - 17:25:09)

Only 'bootargs'and 'bootcmd' are active. 'bootargs_xxx' and 'bootcmd_xxx' can be used to easily switch between boot modes. Two modes are shown here:

  • NFS boot: kernel and filesystem through remote TFTP/NFS server
  • SD boot: kernel from SPI flash, filesystem on SD card

Other options/combinations are of course possible.

Drivers

  • Can I use the LCD driver with resolutions greater than QVGA?

The original LCD driver (at least up to PSP 2.20.00.06) does only support resolutions up to QVGA. It is really written and tested only for a single LCD panel that has QVGA resolution. Now for system test and demonstration purposes hardware adapters and necessary software were developed using VGA (640x480) resolution. While this may not work for all systems it has been proven to be generally possible. Latest trials with timing modifications resulted in a working display at 800x600@56Hz.

See the VGA topic for more details.