u-boot/doc/README.bcmns3
Rayagonda Kokatanur 89bb20bd38 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>
2020-07-29 10:37:11 -04:00

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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 |
* | |
* ~ ~
* ~ ~
* | |
* |---------------------------|
*/