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Diffstat (limited to 'doc/README.vxworks')
| -rw-r--r-- | doc/README.vxworks | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/doc/README.vxworks b/doc/README.vxworks index 3e08711207..12a0d744d8 100644 --- a/doc/README.vxworks +++ b/doc/README.vxworks @@ -2,6 +2,7 @@ # # Copyright (C) 2013, Miao Yan <miao.yan@windriver.com> # Copyright (C) 2015-2018, Bin Meng <bmeng.cn@gmail.com> +# Copyright (C) 2019, Lihua Zhao <lihua.zhao@windriver.com> VxWorks Support =============== @@ -24,6 +25,15 @@ From VxWorks 7, VxWorks starts adopting device tree as its hardware description mechanism (for PowerPC and ARM), thus requiring boot interface changes. This section will describe the new interface. +Since VxWorks 7 SR0640 release, VxWorks starts using Linux compatible standard +DTB for some boards. With that, the exact same bootm flow as used by Linux is +used, which includes board-specific DTB fix up. To keep backward compatibility, +only when the least significant bit of flags in bootargs is set, the standard +DTB will be used. Otherwise it falls back to the legacy bootm flow. + +For legacy bootm flow, make sure the least significant bit of flags in bootargs +is cleared. The calling convention is described below: + For PowerPC, the calling convention of the new VxWorks entry point conforms to the ePAPR standard, which is shown below (see ePAPR for more details): @@ -33,6 +43,9 @@ For ARM, the calling convention is shown below: void (*kernel_entry)(void *fdt_addr) +When using the Linux compatible standard DTB, the calling convention of VxWorks +entry point is exactly the same as the Linux kernel. + When booting a VxWorks 7 kernel (uImage format), the parameters passed to bootm is like below: |