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armv8/ls2085a: Update SoC README for DDR layout

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Update SoC README to provide details of
 - Memory regions
 - Memory used by MC and Debug server

Signed-off-by: Bhupesh Sharma <bhupesh.sharma at freescale.com>
Signed-off-by: Prabhakar Kushwaha <prabhakar at freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>
This commit is contained in:
Prabhakar Kushwaha 2015-05-28 14:54:11 +05:30 committed by York Sun
parent a2dc818f21
commit 092da485c7
1 changed files with 25 additions and 0 deletions
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25
arch/arm/cpu/armv8/fsl-lsch3/README
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@ -9,6 +9,31 @@ Freescale LayerScape with Chassis Generation 3
This architecture supports Freescale ARMv8 SoCs with Chassis generation 3,
for example LS2085A.
DDR Layout
============
Entire DDR region splits into two regions.
- Region 1 is at address 0x8000_0000 to 0xffff_ffff.
- Region 2 is at 0x80_8000_0000 to the top of total memory,
for example 16GB, 0x83_ffff_ffff.
All DDR memory is marked as cache-enabled.
When MC and Debug server is enabled, they carve 512MB away from the high
end of DDR. For example, if the total DDR is 16GB, it shrinks to 15.5GB
with MC and Debug server enabled. Linux only sees 15.5GB.
The reserved 512MB layout looks like
+---------------+ <-- top/end of memory
| 256MB | debug server
+---------------+
| 256MB | MC
+---------------+
| ... |
MC requires the memory to be aligned with 512MB, so even debug server is
not enabled, 512MB is reserved, not 256MB.
Flash Layout
============