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Diffstat (limited to 'doc/README.vxworks')
| -rw-r--r-- | doc/README.vxworks | 51 |
1 files changed, 32 insertions, 19 deletions
diff --git a/doc/README.vxworks b/doc/README.vxworks index 3433e4f..3239c5b 100644 --- a/doc/README.vxworks +++ b/doc/README.vxworks @@ -17,9 +17,7 @@ For booting old kernels (6.9.x) on PowerPC and ARM, and all kernel versions on other architectures, 'bootvx' shall be used. For booting VxWorks 7 kernels on PowerPC and ARM, 'bootm' shall be used. -64-bit x86 kernel cannot be loaded as of today. - -VxWork 7 on PowerPC and ARM +VxWorks 7 on PowerPC and ARM --------------------------- From VxWorks 7, VxWorks starts adopting device tree as its hardware decription mechansim (for PowerPC and ARM), thus requiring boot interface changes. @@ -30,11 +28,11 @@ the ePAPR standard, which is shown below (see ePAPR for more details): void (*kernel_entry)(fdt_addr, 0, 0, EPAPR_MAGIC, boot_IMA, 0, 0) -For ARM, the calling convention is show below: +For ARM, the calling convention is shown below: void (*kernel_entry)(void *fdt_addr) -When booting new VxWorks kernel (uImage format), the parameters passed to bootm +When booting a VxWorks 7 kernel (uImage format), the parameters passed to bootm is like below: bootm <kernel image address> - <device tree address> @@ -46,7 +44,7 @@ board-specific address before loading VxWorks. U-Boot supplies its address via "bootaddr" environment variable. To check where the bootline should be for a specific board, go to the VxWorks BSP for that board, and look for a parameter called BOOT_LINE_ADRS. Assign its value to "bootaddr". A typical -value for "bootaddr" is 0x101200. +value for "bootaddr" on an x86 board is 0x101200. If a "bootargs" variable is defined, its content will be copied to the memory location pointed by "bootaddr" as the kernel bootline. If "bootargs" is not @@ -67,19 +65,34 @@ look like VxWorks hangs somewhere as nothing outputs on the serial console. x86-specific information ------------------------ -Before loading an x86 kernel, two additional environment variables need to be -provided. They are "e820data" and "e820info", which represent the address of -E820 table and E820 information (defined by VxWorks) in system memory. - -Check VxWorks kernel configuration to look for BIOS_E820_DATA_START and -BIOS_E820_INFO_START, and assign their values to "e820data" and "e820info" -accordingly. If neither of these two are supplied, U-Boot assumes a default -location at 0x4000 for "e820data" and 0x4a00 for "e820info". Typical values -for "e820data" and "e820info" are 0x104000 and 0x104a00. But there is one -exception on Intel Galileo, where "e820data" and "e820info" should be left -unset, which assume the default location for VxWorks. - -Note since currently U-Boot does not support ACPI yet, VxWorks kernel must +Before loading an x86 kernel, one additional environment variable need to be +provided. This is "vx_phys_mem_base", which represent the physical memory +base address of VxWorks. + +Check VxWorks kernel configuration to look for LOCAL_MEM_LOCAL_ADRS. For +VxWorks 7, this is normally a virtual address and you need find out its +corresponding physical address and assign its value to "vx_phys_mem_base". + +For boards on which ACPI is not supported by U-Boot yet, VxWorks kernel must be configured to use MP table and virtual wire interrupt mode. This requires INCLUDE_MPTABLE_BOOT_OP and INCLUDE_VIRTUAL_WIRE_MODE to be included in a VxWorks kernel configuration. + +Both 32-bit x86 and 64-bit x64 kernels can be loaded. + +There are two types of graphics console drivers in VxWorks. One is the 80x25 +VGA text mode driver. The other one is the EFI console bitmapped graphics mode +driver. To make these drivers function, U-Boot needs to load and run the VGA +BIOS of the graphics card first. + + - If the kernel is configured with 80x25 VGA text mode driver, + CONFIG_FRAMEBUFFER_SET_VESA_MODE must be unset in U-Boot. + - If the kernel is configured with bitmapped graphics mode driver, + CONFIG_FRAMEBUFFER_SET_VESA_MODE need remain set but care must be taken + at which VESA mode is to be set. The supported pixel format is 32-bit + RGBA, hence the available VESA mode can only be one of the following: + * FRAMEBUFFER_VESA_MODE_10F + * FRAMEBUFFER_VESA_MODE_112 + * FRAMEBUFFER_VESA_MODE_115 + * FRAMEBUFFER_VESA_MODE_118 + * FRAMEBUFFER_VESA_MODE_11B |