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| author | Bin Meng <bmeng.cn@gmail.com> | 2021-07-12 03:48:02 +0300 |
|---|---|---|
| committer | Anup Patel <anup@brainfault.org> | 2021-07-17 15:13:37 +0300 |
| commit | 2c74dc3c47f7e77b42735e383292de920273bf97 (patch) | |
| tree | 648bf3bccfef4b7f2288a94d29e008d931913835 /docs | |
| parent | a4555e5698c1fbf5d89a849fbc8c01594401cf0a (diff) | |
| download | opensbi-2c74dc3c47f7e77b42735e383292de920273bf97.tar.xz | |
docs: Document FW_PIC compile time option
FW_PIC=y is on by default, but the doc is missing when this was
introduced. Add some description for it.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/firmware/fw.md | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/docs/firmware/fw.md b/docs/firmware/fw.md index 913f939..5a67848 100644 --- a/docs/firmware/fw.md +++ b/docs/firmware/fw.md @@ -69,6 +69,12 @@ parameters: argument by the prior booting stage. * **FW_FDT_PADDING** - Optional zero bytes padding to the embedded flattened device tree binary file specified by **FW_FDT_PATH** option. +* **FW_PIC** - "FW_PIC=y" generates position independent executable firmware + images. OpenSBI can run at arbitrary address with appropriate alignment. + Therefore, the original relocation mechanism ("FW_PIC=n") will be skipped. + In other words, OpenSBI will directly run at the load address without any + code movement. This option requires a toolchain with PIE support, and it + is on by default. Additionally, each firmware type as a set of type specific configuration parameters. Detailed information for each firmware type can be found in the |