mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-17 18:28:55 +00:00
7a139959d0
mkimage -T mxs now support new flag in config file: DISPLAYPROGRESS - makes boot process print HTLLC characters for each BootROM instruction. Signed-off-by: Alexey Ignatov <lexszero@gmail.com>
170 lines
6.7 KiB
Text
170 lines
6.7 KiB
Text
Freescale i.MX233/i.MX28 SB image generator via mkimage
|
|
=======================================================
|
|
|
|
This tool allows user to produce SB BootStream encrypted with a zero key.
|
|
Such a BootStream is then bootable on i.MX23/i.MX28.
|
|
|
|
Usage -- producing image:
|
|
=========================
|
|
The mxsimage tool is targeted to be a simple replacement for the elftosb2 .
|
|
To generate an image, write an image configuration file and run:
|
|
|
|
mkimage -A arm -O u-boot -T mxsimage -n <path to configuration file> \
|
|
<output bootstream file>
|
|
|
|
The output bootstream file is usually using the .sb file extension. Note
|
|
that the example configuration files for producing bootable BootStream with
|
|
the U-Boot bootloader can be found under arch/arm/boot/cpu/arm926ejs/mxs/
|
|
directory. See the following files:
|
|
|
|
mxsimage.mx23.cfg -- This is an example configuration for i.MX23
|
|
mxsimage.mx28.cfg -- This is an example configuration for i.MX28
|
|
|
|
Each configuration file uses very simple instruction semantics and a few
|
|
additional rules have to be followed so that a useful image can be produced.
|
|
These semantics and rules will be outlined now.
|
|
|
|
- Each line of the configuration file contains exactly one instruction.
|
|
- Every numeric value must be encoded in hexadecimal and in format 0xabcdef12 .
|
|
- The configuration file is a concatenation of blocks called "sections" and
|
|
optionally "DCD blocks" (see below), and optional flags lines.
|
|
- Each "section" is started by the "SECTION" instruction.
|
|
- The "SECTION" instruction has the following semantics:
|
|
|
|
SECTION u32_section_number [BOOTABLE]
|
|
- u32_section_number :: User-selected ID of the section
|
|
- BOOTABLE :: Sets the section as bootable
|
|
|
|
- A bootable section is one from which the BootROM starts executing
|
|
subsequent instructions or code. Exactly one section must be selected
|
|
as bootable, usually the one containing the instructions and data to
|
|
load the bootloader.
|
|
|
|
- A "SECTION" must be immediatelly followed by a "TAG" instruction.
|
|
- The "TAG" instruction has the following semantics:
|
|
|
|
TAG [LAST]
|
|
- LAST :: Flag denoting the last section in the file
|
|
|
|
- After a "TAG" unstruction, any of the following instructions may follow
|
|
in any order and any quantity:
|
|
|
|
NOOP
|
|
- This instruction does nothing
|
|
|
|
LOAD u32_address string_filename
|
|
- Instructs the BootROM to load file pointed by "string_filename" onto
|
|
address "u32_address".
|
|
|
|
LOAD IVT u32_address u32_IVT_entry_point
|
|
- Crafts and loads IVT onto address "u32_address" with the entry point
|
|
of u32_IVT_entry_point.
|
|
- i.MX28-specific instruction!
|
|
|
|
LOAD DCD u32_address u32_DCD_block_ID
|
|
- Loads the DCD block with ID "u32_DCD_block_ID" onto address
|
|
"u32_address" and executes the contents of this DCD block
|
|
- i.MX28-specific instruction!
|
|
|
|
FILL u32_address u32_pattern u32_length
|
|
- Starts to write memory from addres "u32_address" with a pattern
|
|
specified by "u32_pattern". Writes exactly "u32_length" bytes of the
|
|
pattern.
|
|
|
|
JUMP [HAB] u32_address [u32_r0_arg]
|
|
- Jumps onto memory address specified by "u32_address" by setting this
|
|
address in PT. The BootROM will pass the "u32_r0_arg" value in ARM
|
|
register "r0" to the executed code if this option is specified.
|
|
Otherwise, ARM register "r0" will default to value 0x00000000. The
|
|
optional "HAB" flag is i.MX28-specific flag turning on the HAB boot.
|
|
|
|
CALL [HAB] u32_address [u32_r0_arg]
|
|
- See JUMP instruction above, as the operation is exactly the same with
|
|
one difference. The CALL instruction does allow returning into the
|
|
BootROM from the executed code. U-Boot makes use of this in it's SPL
|
|
code.
|
|
|
|
MODE string_mode
|
|
- Restart the CPU and start booting from device specified by the
|
|
"string_mode" argument. The "string_mode" differs for each CPU
|
|
and can be:
|
|
i.MX23, string_mode = USB/I2C/SPI1_FLASH/SPI2_FLASH/NAND_BCH
|
|
JTAG/SPI3_EEPROM/SD_SSP0/SD_SSP1
|
|
i.MX28, string_mode = USB/I2C/SPI2_FLASH/SPI3_FLASH/NAND_BCH
|
|
JTAG/SPI2_EEPROM/SD_SSP0/SD_SSP1
|
|
|
|
- An optional "DCD" blocks can be added at the begining of the configuration
|
|
file. Note that the DCD is only supported on i.MX28.
|
|
- The DCD blocks must be inserted before the first "section" in the
|
|
configuration file.
|
|
- The DCD block has the following semantics:
|
|
|
|
DCD u32_DCD_block_ID
|
|
- u32_DCD_block_ID :: The ID number of the DCD block, must match
|
|
the ID number used by "LOAD DCD" instruction.
|
|
|
|
- The DCD block must be followed by one of the following instructions. All
|
|
of the instructions operate either on 1, 2 or 4 bytes. This is selected by
|
|
the 'n' suffix of the instruction:
|
|
|
|
WRITE.n u32_address u32_value
|
|
- Write the "u32_value" to the "u32_address" address.
|
|
|
|
ORR.n u32_address u32_value
|
|
- Read the "u32_address", perform a bitwise-OR with the "u32_value" and
|
|
write the result back to "u32_address".
|
|
|
|
ANDC.n u32_address u32_value
|
|
- Read the "u32_address", perform a bitwise-AND with the complement of
|
|
"u32_value" and write the result back to "u32_address".
|
|
|
|
EQZ.n u32_address u32_count
|
|
- Read the "u32_address" at most "u32_count" times and test if the value
|
|
read is zero. If it is, break the loop earlier.
|
|
|
|
NEZ.n u32_address u32_count
|
|
- Read the "u32_address" at most "u32_count" times and test if the value
|
|
read is non-zero. If it is, break the loop earlier.
|
|
|
|
EQ.n u32_address u32_mask
|
|
- Read the "u32_address" in a loop and test if the result masked with
|
|
"u32_mask" equals the "u32_mask". If the values are equal, break the
|
|
reading loop.
|
|
|
|
NEQ.n u32_address u32_mask
|
|
- Read the "u32_address" in a loop and test if the result masked with
|
|
"u32_mask" does not equal the "u32_mask". If the values are not equal,
|
|
break the reading loop.
|
|
|
|
NOOP
|
|
- This instruction does nothing.
|
|
|
|
- An optional flags lines can be one of the following:
|
|
|
|
DISPLAYPROGRESS
|
|
- Enable boot progress output form the BootROM.
|
|
|
|
- If the boot progress output from the BootROM is enabled, the BootROM will
|
|
produce a letter on the Debug UART for each instruction it started processing.
|
|
Here is a mapping between the above instructions and the BootROM output:
|
|
|
|
H -- SB Image header loaded
|
|
T -- TAG instruction
|
|
N -- NOOP instruction
|
|
L -- LOAD instruction
|
|
F -- FILL instruction
|
|
J -- JUMP instruction
|
|
C -- CALL instruction
|
|
M -- MODE instruction
|
|
|
|
Usage -- verifying image:
|
|
=========================
|
|
|
|
The mxsimage can also verify and dump contents of an image. Use the following
|
|
syntax to verify and dump contents of an image:
|
|
|
|
mkimage -l <input bootstream file>
|
|
|
|
This will output all the information from the SB image header and all the
|
|
instructions contained in the SB image. It will also check if the various
|
|
checksums in the SB image are correct.
|