Hello Wolfgang and All,
The next release of VxWorks will adopt device tree as its hardware description mechanism (for PowerPC and ARM), thus requiring boot interface changes for these two architechtures. And we would like to better support U-Boot with our operating system, because almost all the PowerPC and ARM boards that we support come with U-Boot pre-flashed and we would like to create better experience for our users.
Currently, U-Boot provides a 'bootvx' command (bootm internally uses bootvx) to load and run VxWorks image (for both ELF format or raw binary), for example:
bootvx 0x1000000
or just:
bootvx
if the environmental variable 'loadaddr' is set. The 'bootvx' will setup bootline and jump to the VxWorks entry using the following calling convention:
(void)(*entry)(int arg /* 0 */)
With the new VxWorks, the kernel entry interface for PowerPC is going to be changed to conform to the ePAPR standard, and for ARM, we need deivce tree's physical address to be passed to the kernel like this:
(void)(*entry)(void *fdt_addr)
And VxWorks bootline will be saved into deivce tree's 'bootargs' node as specified by the ePAPR (for both PowerPC and ARM).
The 'bootvx' commnad stays unchaged, and is still avalaible under the configuration option CONFIG_CMD_ELF for older kernels. A new option CONFIG_BOOTM_VXWORKS is added for bootm to align with other bootm supported operating systems.
So the do_bootm_vxworks will work as below:
#if (libfdt && (ppc || arm)) if (using device tree) boot_vxworks_with_device_tree else #endif bootvx(...);
The following patches are rebased on today's master branch (commit 6856254fc05d67f874d08a534724c842f93a605f).
Thanks,
Miao Yan (5): common/cmd_bootm.c: seperate do_bootm_vxworks related code from CONFIG_CMD_ELF. common/config_defaults.h: make CONFIG_BOOTM_VXWORKS default configuration common/cmd_bootm: extend do_bootm_vxworks to support the new VxWorks boot interface. common/fdt_support.c: avoid unintended return from fdt_fixup_memory_banks() doc/README.vxworks: add a document describing the new VxWorks boot interface
arch/arm/lib/bootm.c | 21 +++++++++++ arch/powerpc/lib/bootm.c | 52 ++++++++++++++++++++++++++ common/cmd_bootm.c | 90 +++++++++++++++++++++++++++++++++++++++++---- common/fdt_support.c | 5 ++- doc/README.vxworks | 34 +++++++++++++++++ include/common.h | 4 ++ include/config_defaults.h | 1 + include/vxworks.h | 2 + 8 files changed, 200 insertions(+), 9 deletions(-) create mode 100644 doc/README.vxworks