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Code Update on FSP based machine
================================
There are three OPAL calls for code update on FSP based machine: ::
#define OPAL_FLASH_VALIDATE 76
#define OPAL_FLASH_MANAGE 77
#define OPAL_FLASH_UPDATE 78
OPAL_FLASH_VALIDATE
-------------------
Validate new image is valid for this platform or not. We do below
validation in OPAL:
- We do below sys parameters validation to confirm inband
update is allowed.
- Platform is managed by HMC or not?.
- Code update policy (inband code update allowed?).
- We parse candidate image header (first 4k bytes) to perform
below validations.
- Image magic number.
- Image version to confirm image is valid for this platform.
Input
^^^^^
buffer
First 4k bytes of new image
size
Input buffer size
Output
^^^^^^
buffer
Output result (current and new image version details)
size
Output buffer size
result
Token to identify what will happen if update is attempted
See hw/fsp/fsp-codeupdate.h for token values.
Return value
^^^^^^^^^^^^
Validation status
OPAL_FLASH_MANAGE
-----------------
Commit/Reject image.
- We can commit new image (T -> P), if system is running with T side image.
- We can reject T side image, if system is running with P side image.
**Note:** If a platform is running from a T side image when an update is to be
applied, then the platform may automatically commit the current T side
image to the P side to allow the new image to be updated to the
temporary image area.
Input
^^^^^
op
Operation (1 : Commit /0 : Reject)
Return value
Commit operation status (0 : Success)
OPAL_FLASH_UPDATE
------------------
Update new image. It only sets the flag, actual update happens
during system reboot/shutdown.
Host splits FW image to scatter/gather list and sends it to OPAL.
OPAL parse the image to get indivisual LID and passes it to FSP
via MBOX command.
FW update flow :
- if (running side == T)
Swap P & T side
- Start code update
- Delete T side LIDs
- Write LIDs
- Code update complete
- Deep IPL
Input
^^^^^
list
Real address of image scatter/gather list of the FW image
Return value:
Update operation status (0: update requested)
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