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Memory layout
- From: "Syed Ismail" <ismail dot riyaz at dyansys dot com>
- To: ecos-discuss at ecos dot sourceware dot org
- Date: 10 Apr 2008 19:08:45 -0000
- Subject: [ECOS] Memory layout
- Reply-to: "Syed Ismail" <ismail dot riyaz at dyansys dot com>
Hello
I have an arm based mx31 freescale processor. Using patches from freescale, i was able to create redboot image ang with minor configuration changes it worked. Now i have a few questions.
1. The image is a romram image. Loads from nor flash and executes in ram. The ram is an sdram at physical addr 0x80000000, virt addr mapped to 0x0. I now want use a ram at a different physical address. What changes do i do?
2. What does this do
X_ARM_MMU_SECTION(0x800, 0x000, 0x80, ARM_CACHEABLE, ARM_BUFFERABLE, ARM_ACCESS_PERM_RW_RW); /* SDRAM */
X_ARM_MMU_SECTION(0x800, 0x800, 0x80, ARM_CACHEABLE, ARM_BUFFERABLE, ARM_ACCESS_PERM_RW_RW); /* SDRAM */
Should i add the new ram physical address here? What is ARM_CACHEABLE and BUFFERABLE? Does the above write into registers of processor or is it only a table used by redboot code?
3. As a general query, is it possible to load and execute images like redboot from a PSRAM.
Thanks
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