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Add support for the MSTAR I2C ISP protocol

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Basically, among other chips, MSTAR manufactures SoCs that equip TV sets
and computer screens, and it seems that all of their products use the
same in-system programming protocol. Basically, they use the DDC channel
of VGA or DVI connectors, which is actually an I2C bus, to encapsulate
SPI frames (the flash chip is connected to the SoC through an SPI bus).

I wrote this patch since the screen I bought had a software bug, and the
manufacturer only released a new firmware binary, but no tool or
instructions on flashing it.

More details can be found here:
http://boeglin.org/blog/index.php?entry=Flashing-a-BenQ-Z-series-for-free(dom)

I only read code from Linux kernel archives published by Acer to figure
out the protocol (for a touchscreen controller and an NFC chip, both by
MSTAR, that share the same ISP protocol), so I don't think there are
any legal problems with it.

Compilation is currently disabled by default in the Makefile.
If in doubt, additional Makefile bugs were added by Stefan.

Corresponding to flashrom svn r1860.

Signed-off-by: Alexandre Boeglin <alex@boeglin.org>
Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Acked-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
This commit is contained in:
Alexandre Boeglin
2014-12-20 20:25:19 +00:00
committed by Stefan Tauner
parent 5859ced80f
commit 80e6471588
5 changed files with 339 additions and 0 deletions
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11
programmer.h
View File

@ -98,6 +98,9 @@ enum programmer {
#endif
#if CONFIG_USBBLASTER_SPI == 1
PROGRAMMER_USBBLASTER_SPI,
#endif
#if CONFIG_MSTARDDC_SPI == 1
PROGRAMMER_MSTARDDC_SPI,
#endif
PROGRAMMER_INVALID /* This must always be the last entry. */
};
@ -474,6 +477,11 @@ int usbblaster_spi_init(void);
extern const struct dev_entry devs_usbblasterspi[];
#endif
/* mstarddc_spi.c */
#if CONFIG_MSTARDDC_SPI == 1
int mstarddc_spi_init(void);
#endif
/* rayer_spi.c */
#if CONFIG_RAYER_SPI == 1
int rayer_spi_init(void);
@ -555,6 +563,9 @@ enum spi_controller {
#if CONFIG_USBBLASTER_SPI == 1
SPI_CONTROLLER_USBBLASTER,
#endif
#if CONFIG_MSTARDDC_SPI == 1
SPI_CONTROLLER_MSTARDDC,
#endif
};
#define MAX_DATA_UNSPECIFIED 0