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Update some comments

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This commit is contained in:
Gregory Nutt 2016-03-29 15:35:47 -06:00
parent 1c56b8dd87
commit 679a26cdf8
1 changed files with 12 additions and 3 deletions
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15
arch/arm/src/imx6/chip/imx_memorymap.h
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@ -854,10 +854,19 @@
/* Level 2 Page table start addresses.
*
* 16Kb of memory is reserved hold the page table for the virtual mappings. A
* The maximum size of the L1 page table is:
*
* (4GB address range / 1 MB per section ) * 4 bytes per entry = 16KB
*
* The maximum size of the L2 page table is:
*
* (4GB address range / 4 KB per page ) * 4 bytes per entry = 4MB
*
* 16KB of memory is reserved hold the page table for the virtual mappings. A
* portion of this table is not accessible in the virtual address space (for
* normal operation). There is this large whole in the physcal address space
* for which there will never be level 1 mappings:
* normal operation with a one-to-one address mapping). There is this large
* hole in the physcal address space for which there will never be level 1
* mappings:
*
* 0x80000000-0xefffffff: Undefined (1.75 GB)
*