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Diffstat (limited to 'docs/porting-guide.md')
| -rw-r--r-- | docs/porting-guide.md | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/docs/porting-guide.md b/docs/porting-guide.md index a74966c3..e8486f12 100644 --- a/docs/porting-guide.md +++ b/docs/porting-guide.md @@ -1121,10 +1121,15 @@ The default implementation spins forever. unsigned int flags Return : int -BL1 calls this function while handling FWU copy and authenticate SMCs. The -platform must ensure that the provided `mem_base` and `mem_size` are mapped into -BL1, and that this memory corresponds to either a secure or non-secure memory -region as indicated by the security state of the `flags` argument. +BL1 calls this function while handling FWU related SMCs, more specifically when +copying or authenticating an image. Its responsibility is to ensure that the +region of memory identified by `mem_base` and `mem_size` is mapped in BL1, and +that this memory corresponds to either a secure or non-secure memory region as +indicated by the security state of the `flags` argument. + +This function can safely assume that the value resulting from the addition of +`mem_base` and `mem_size` fits into a `uintptr_t` type variable and does not +overflow. This function must return 0 on success, a non-null error code otherwise. |