diff options
| -rw-r--r-- | common/bootm_os.c | 39 | ||||
| -rw-r--r-- | doc/README.vxworks | 13 | ||||
| -rw-r--r-- | include/vxworks.h | 3 |
3 files changed, 53 insertions, 2 deletions
diff --git a/common/bootm_os.c b/common/bootm_os.c index de0709f8ba..d89ddc32b0 100644 --- a/common/bootm_os.c +++ b/common/bootm_os.c @@ -319,8 +319,8 @@ static void do_bootvx_fdt(bootm_headers_t *images) puts("## vxWorks terminated\n"); } -int do_bootm_vxworks(int flag, int argc, char * const argv[], - bootm_headers_t *images) +static int do_bootm_vxworks_legacy(int flag, int argc, char * const argv[], + bootm_headers_t *images) { if (flag != BOOTM_STATE_OS_GO) return 0; @@ -336,6 +336,41 @@ int do_bootm_vxworks(int flag, int argc, char * const argv[], return 1; } + +int do_bootm_vxworks(int flag, int argc, char * const argv[], + bootm_headers_t *images) +{ + char *bootargs; + int pos; + unsigned long vxflags; + bool std_dtb = false; + + /* get bootargs env */ + bootargs = env_get("bootargs"); + + if (bootargs != NULL) { + for (pos = 0; pos < strlen(bootargs); pos++) { + /* find f=0xnumber flag */ + if ((bootargs[pos] == '=') && (pos >= 1) && + (bootargs[pos - 1] == 'f')) { + vxflags = simple_strtoul(&bootargs[pos + 1], + NULL, 16); + if (vxflags & VXWORKS_SYSFLG_STD_DTB) + std_dtb = true; + } + } + } + + if (std_dtb) { + if (flag & BOOTM_STATE_OS_PREP) + printf(" Using standard DTB\n"); + return do_bootm_linux(flag, argc, argv, images); + } else { + if (flag & BOOTM_STATE_OS_PREP) + printf(" !!! WARNING !!! Using legacy DTB\n"); + return do_bootm_vxworks_legacy(flag, argc, argv, images); + } +} #endif #if defined(CONFIG_CMD_ELF) 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: diff --git a/include/vxworks.h b/include/vxworks.h index 1a29509460..d90d862fb7 100644 --- a/include/vxworks.h +++ b/include/vxworks.h @@ -9,6 +9,9 @@ #include <efi_api.h> +/* Use Linux compatible standard DTB */ +#define VXWORKS_SYSFLG_STD_DTB 0x1 + /* * Physical address of memory base for VxWorks x86 * This is LOCAL_MEM_LOCAL_ADRS in the VxWorks kernel configuration. |