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doc: add README doc for bcmns3 platform 

Add README doc for bcmns3 platform.

Signed-off-by: Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Rayagonda Kokatanur 2020-07-15 22:49:08 +05:30 committed by Tom Rini
parent e32a25e512
commit 89bb20bd38
1 changed files with 74 additions and 0 deletions
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BCMNS3 QSPI memory layout
=========================
BCMNS3 has total 8MB non-volatile SPI flash memory. It is used to store
different images like fip.bin, nitro firmware, DDR shmo value and other backup
images.
Following is the QSPI flash memory layout.
/* QSPI layout
* |---------------------------|->0x000000
* | |
* | |
* | fip.bin |
* | 2MB |
* | |
* ~ ~
* ~ ~
* | |
* | |
* | |
* |---------------------------|->0x200000
* | |
* | |
* | |
* | fip.bin (Mirror) |
* | 2MB |
* ~ ~
* ~ ~
* | |
* | |
* | |
* |---------------------------|->0x400000
* | |
* | Nitro NS3 Config |
* | 1.5M |
* | |
* ~ ~
* ~ ~
* | |
* |---------------------------|->0x580000
* | Nitro NS3 Config |
* | 1.5M |
* | (Mirror) |
* ~ ~
* ~ ~
* | |
* |---------------------------|->0x700000
* | Nitro NS3 bspd Config |
* | 64KB |
* ~ ~
* ~ ~
* | |
* |---------------------------|->0x710000
* | Nitro NS3 bspd Config |
* | 64KB |
* ~ (Mirror) ~
* ~ ~
* | |
* |---------------------------|->0x720000
* | SHMOO |
* | 64KB |
* | |
* ~ ~
* ~ ~
* |---------------------------|->0x730000
* | Meta Data |
* | 832KB |
* | |
* ~ ~
* ~ ~
* | |
* |---------------------------|
*/