This patch is based on ARM pbl support and allows
creating a pre-bootloader binary for compressed image.
For different MIPS SoCs (or even for different boards based
on the same SoC) the operations carried on in start-pbl.S
can be very different. The additional constraints can be imposed
on the size of the boot code or the special magic labels in
the beginning of the boot code; In some cases it could be
necessary to show CPU is alive as early as possible
(transmit a char via UART or blink a LED).
So the demands for pbl start operation can be very different.
E.g. malta board store boot code at the NOR flash mapped
to the MIPS power-on address (0xbfc00000); it is the most
simple case: we need just copy pbl image from direct-mapped
flash to RAM and jump there.
The XBurst-powered boards store boot code in the beginning
of a NAND flash or in the beginning of SD/MMC card.
In this case we must use simple and short NAND or SD/MMC access
routines to copy pbl image to RAM.
To meet so different demands a simple technique is selected:
* MIPS pbl entry point located in file arch/mips/boot/start-pbl.S.
* MIPS pbl code (see start-pbl.S) assumes that every pbl-enabled
board has a arch/mips/boards/<BOARD>/include/board/board_pbl_start.h
header file. This file must contain definition of
the board_pbl_start macro. This macro is used as start of pbl image;
* the most popular asm routines (stack setup, relocation to link
address, NS16550 initialization (WIP) and so on) are containt
in the arch/mips/include/asm/pbl_macros.h header file.
So board pbl macro can use it if necessary.
It is possible to create similar headers with macros for each
specific SoC; so even if we have many different boards based
on the same SoC the board_pbl_start macro for every board
can be short and clear.
* after board-specific initialization the stack pointer
is initialized and pbl C code is started.
Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
The commit
commit d25d94bea6
Author: Antony Pavlov <antonynpavlov@gmail.com>
Date: Fri Jun 1 13:23:20 2012 +0400
MIPS: make possible board-specific header files
This patch makes possible to put a board-specific
header file (e. g. foobar.h) to arch/mips/boards/*/include/board/.
breaks the out-of-tree build for the boards that use it (rzx50).
Reported-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Cc: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Depending on the SoC a barebox.bin, barebox.netx, barebox.s5p, MLO image
is generated. With pbl support there now is an additional
arch/arm/pbl/zbarebox.bin image.
To help the user to determine which image should be flashed to his device,
generate a barebox-flash-image link.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
This patch makes possible to put a board-specific
header file (e. g. foobar.h) to arch/mips/boards/*/include/board/.
Header file usage:
#include <board/foobar.h>
Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
The only supported peripheral is ns16550 serial port.
Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
The machine uses only big-endian mode.
Only supported peripheral is serial port.
The machine supports only MIPS32 CPUs.
Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Antony Pavlov
Oleksij Rempel
Sascha Hauer