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डेटा पत्रक - Booting Windows CE Using RedBoot from a Windows Based Host PC - Cirrus Logic

भाग संख्या AN254
समारोह Booting Windows CE Using RedBoot from a Windows Based Host PC
मैन्युफैक्चरर्स Cirrus Logic 
लोगो Cirrus Logic लोगो 
पूर्व दर्शन
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AN254 pdf
AN254
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As it turns out, the EP9312 has a few unique features that most other SOC processors don't have. It has
an internal BootROM (masked in the silicon, unchangeable by the user) that performs the functions that
a boot loader performs. While this is an outstanding feature, the BootROM needs to make certain assump-
tions in order to be functional in most situations. For example, the memory interface is set to less than
optimal speed. More importantly, the PLL is set for EXTERNAL 1:1 mode. In most systems, this means
that the EP9312 would run at about 14 MHz. This is where the RedBoot boot loader comes in.
RedBoot configures the optimum settings for the task at hand. Generally, 14 MHz would be inadequate
for transferring a file over an Ethernet link. The boot loader sets up memory (including SDRAM and
FLASH access times) and sets up the PLL to run the processor at a more effective speed. After the main
hardware is put into a “quiescent” state, the boot loader starts initializing its features. It sets up a TFTP
stack, sets up a FLASH file system, gets the serial port going for user interaction and performs other tasks
needed for effective program loading.
4. GETTING STARTED: Downloading RedBoot
There are two files needed to download RedBoot:
- download.exe
- redboot.bin
1) Power down the EDB9312 board, and change JP92 on your board to connect position 1-2. (This task
may be easier if you remove the touchscreen cable from P91.)
Figure 1. Jumper Positions
2) For simplicity, place the download.exe and the RedBoot binary file in the same directory on the host
PC.
3) Connect a null modem cable to the bottom serial port on the EDB9312 board, and to your host PC.
Determine which communications port on the host PC you are connecting to.
4) MAKE SURE YOU DISABLE ANY PALM SYNC SOFTWARE RUNNING ON THE HOST PC.
5) Open a DOS window and execute the following command:
2

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