If the boot settings are set to "DSP self-boot" the DSP power domain is automatically switched to ON in hardware, the ARM does not need to run for that. If the DSP boot setting is in 'ARM boot' mode, the DSP is kept in power-off and in reset, it must be controlled by the ARM.
In "DSP sel-boot" the ARM and DSP will start booting in parallel, using the AEMIF interface. The DSP boots at another address than the ARM, so a NOR-flash would have to contain two images. See the DM6446 datasheet (SPRS283) for this. When you have a NOR-flash connected, this goes OK. The DSP cannot boot from NAND-Flash and so it SHOULD NOT not be in 'self-boot' mode when using NAND-flash. Arie de Muijnck ________________________________ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of kashin Lin Sent: Sunday, January 20, 2008 10:32 To: [email protected] Subject: About DSP boot mode Hi, i wonder the details of DSP self-boot mode. as i comprehend, "ARM boot DSP mode" needs ARM to configure DSP's power domain, set DSP start address, etc. how about DSP self-boot mode? ex: what's the default DSP start address? what's the difference between these two modes except the way DSP start? the document i found like "ARM subsystem reference guide (sprue14a)", "DSP subsystem reference guide (sprue15)", only mentioned about "ARM boot DSP mode". are there any document i can refer to? thanks for any suggestions. -------------------------------------------------------- CONFIDENTIALITY NOTICE - This e-mail transmission, and any documents, files or previous e-mail messages attached to it may contain information that is confidential or legally privileged. If you are not the intended recipient, or a person responsible for delivering it to the intended recipient, you are hereby notified that you must not read this transmission and that any disclosure, copying, printing, distribution or use of any of the information contained in or attached to this transmission is STRICTLY PROHIBITED. If you have received this transmission in error, please immediately notify Arie Muijnck by telephone or [EMAIL PROTECTED] and delete the original transmission and its attachments without reading or saving in any manner.
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