Re: [PATCH 3/5] ARM: socfpga: add bbu handler for spi nor

[Steffen Trumtrar <s.trumtrar@pengutronix.de>]

On Thu, Jul 16, 2015 at 09:01:54AM +0200, Sascha Hauer wrote:
> On Thu, Jul 16, 2015 at 08:12:08AM +0200, Sascha Hauer wrote:
> > On Tue, Jul 14, 2015 at 06:16:37PM +0200, Steffen Trumtrar wrote:
> > > Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
> > > ---
> > >  arch/arm/mach-socfpga/Kconfig               |  8 +++
> > >  arch/arm/mach-socfpga/Makefile              |  1 +
> > >  arch/arm/mach-socfpga/include/mach/bbu.h    | 15 +++++
> > >  arch/arm/mach-socfpga/socfpga_bbu_spi_nor.c | 86 +++++++++++++++++++++++++++++
> > >  4 files changed, 110 insertions(+)
> > >  create mode 100644 arch/arm/mach-socfpga/include/mach/bbu.h
> > >  create mode 100644 arch/arm/mach-socfpga/socfpga_bbu_spi_nor.c
> > > 
> > > diff --git a/arch/arm/mach-socfpga/Kconfig b/arch/arm/mach-socfpga/Kconfig
> > > index 90b3533b1ffb..a85749b7f829 100644
> > > --- a/arch/arm/mach-socfpga/Kconfig
> > > +++ b/arch/arm/mach-socfpga/Kconfig
> > > @@ -20,4 +20,12 @@ config MACH_SOCFPGA_TERASIC_SOCKIT
> > >  	select HAVE_DEFAULT_ENVIRONMENT_NEW
> > >  	bool "Terasic SoCKit"
> > >  
> > > +config BAREBOX_UPDATE_SOCFPGA_SPI_NOR
> > > +	prompt "barebox update SPI NOR XLOAD handler"
> > > +	bool
> > > +	depends on BAREBOX_UPDATE
> > > +	depends on SPI_CADENCE_QUADSPI
> > > +	help
> > > +	  Say Y for barebox update SPI NOR XLOAD handler.
> > > +
> > >  endif
> > > diff --git a/arch/arm/mach-socfpga/Makefile b/arch/arm/mach-socfpga/Makefile
> > > index b81d57da26fd..12c5252d1a6e 100644
> > > --- a/arch/arm/mach-socfpga/Makefile
> > > +++ b/arch/arm/mach-socfpga/Makefile
> > > @@ -3,3 +3,4 @@ pbl-y += init.o freeze-controller.o scan-manager.o system-manager.o
> > >  pbl-y += clock-manager.o
> > >  obj-$(CONFIG_ARCH_SOCFPGA_XLOAD) += xload.o
> > >  obj-$(CONFIG_ARCH_SOCFPGA_FPGA) += fpga.o
> > > +obj-$(CONFIG_BAREBOX_UPDATE_SOCFPGA_SPI_NOR) += socfpga_bbu_spi_nor.o
> > > diff --git a/arch/arm/mach-socfpga/include/mach/bbu.h b/arch/arm/mach-socfpga/include/mach/bbu.h
> > > new file mode 100644
> > > index 000000000000..e4846d36bc5d
> > > --- /dev/null
> > > +++ b/arch/arm/mach-socfpga/include/mach/bbu.h
> > > @@ -0,0 +1,15 @@
> > > +#ifndef __MACH_BBU_H
> > > +#define __MACH_BBU_H
> > > +
> > > +#include <bbu.h>
> > > +
> > > +#ifdef CONFIG_BAREBOX_UPDATE_SOCFPGA_SPI_NOR
> > > +int socfpga_bbu_spi_nor_register_handler(const char *name, char *devicefile);
> > > +#else
> > > +static inline int socfpga_bbu_spi_nor_register_handler(const char *name, char *devicefile)
> > > +{
> > > +	return 0;
> > > +}
> > > +#endif
> > > +
> > > +#endif
> > > diff --git a/arch/arm/mach-socfpga/socfpga_bbu_spi_nor.c b/arch/arm/mach-socfpga/socfpga_bbu_spi_nor.c
> > > new file mode 100644
> > > index 000000000000..cf44bc81c60b
> > > --- /dev/null
> > > +++ b/arch/arm/mach-socfpga/socfpga_bbu_spi_nor.c
> > > @@ -0,0 +1,86 @@
> > > +/*
> > > + * Copyright (c) 2015 Pengutronix, Steffen Trumtrar <s.trumtrar@pengutronix.de>
> > > + *
> > > + * This program is free software; you can redistribute it and/or modify
> > > + * it under the terms of the GNU General Public License version 2
> > > + * as published by the Free Software Foundation.
> > > + *
> > > + * This program is distributed in the hope that it will be useful,
> > > + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> > > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> > > + * GNU General Public License for more details.
> > > + */
> > > +#include <common.h>
> > > +#include <malloc.h>
> > > +#include <bbu.h>
> > > +#include <fs.h>
> > > +#include <fcntl.h>
> > > +#include <linux/stat.h>
> > > +
> > > +static int spi_nor_handler(struct bbu_handler *handler,
> > > +			   struct bbu_data *data)
> > > +{
> > > +	int fd, ret;
> > > +	int *header;
> > > +
> > > +	if (file_detect_type(data->image, data->len) != filetype_arm_barebox) {
> > > +		if (!bbu_force(data, "Not an ARM barebox image"))
> > > +			return -EINVAL;
> > > +	}
> > > +
> > > +	header = data->image;
> > > +
> > > +	if (!header[0x40] == 0x31305341) {
> > 
> > This will never be true. header[0x40] != 0x31305341 instead?
> > Also you probably want to expliticitly use u32 instead of int.
> 
> Does the fixed test return true for the barebox image?
> 
> Note now there's also bbu_register_std_file_update() which will do the
> same as your code in a generic way. The only thing that won't work with
> the generic code is this check above.
> 

Ah, that sounds good. I guess the way to go would be defining a new
filetype ala filetype_ch_image for OMAP. This seems to be the same thing
in the end.
The magic value gets written by scripts/socfpga_mkimage and is mandatory.
(Theoretically I would also have to validate the crc32 checksum, too).

What is not possible then is writing multiple redundant copies of the
prebootloader it seems.

Regards,
Steffen

-- 
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