[PATCH v3] xload: get barebox size from barebox_arm_head

[Jan Weitzel]

Am Mittwoch, den 29.08.2012, 14:21 +0200 schrieb Jean-Christophe
PLAGNIOL-VILLARD:
> On 11:10 Wed 29 Aug     , Jan Weitzel wrote:
> > Add functions to read the barebox_arm_head, check barebox magicword
> > and read out the barebox image size.
> > Create a inital partion of 1Mb to access the barebox image on nand.
> > 
> > Signed-off-by: Jan Weitzel <j.weitzel at phytec.de>
> > ---
> > v2: remove fall back if header read fail 
> > v3: fix header check, rebase master 
> > 
> >  arch/arm/include/asm/barebox-arm-head.h |    4 ++
> >  arch/arm/mach-omap/include/mach/xload.h |    2 +-
> >  arch/arm/mach-omap/xload.c              |   58 ++++++++++++++++++++++++++++--
> >  3 files changed, 59 insertions(+), 5 deletions(-)
> > 
> > diff --git a/arch/arm/include/asm/barebox-arm-head.h b/arch/arm/include/asm/barebox-arm-head.h
> > index 2c250e9..1ddfc0f 100644
> > --- a/arch/arm/include/asm/barebox-arm-head.h
> > +++ b/arch/arm/include/asm/barebox-arm-head.h
> > @@ -1,6 +1,10 @@
> >  #ifndef __ASM_ARM_HEAD_H
> >  #define __ASM_ARM_HEAD_H
> >  
> > +#define ARM_HEAD_SIZE		0x30
> > +#define HEAD_MAGICWORD_OFFSET	0x20
> > +#define HEAD_SIZE_OFFSET	0x2C
> > +
> >  static inline void barebox_arm_head(void)
> >  {
> >  	__asm__ __volatile__ (
> > diff --git a/arch/arm/mach-omap/include/mach/xload.h b/arch/arm/mach-omap/include/mach/xload.h
> > index 844b57f..26f1b68 100644
> > --- a/arch/arm/mach-omap/include/mach/xload.h
> > +++ b/arch/arm/mach-omap/include/mach/xload.h
> > @@ -1,7 +1,7 @@
> >  #ifndef _MACH_XLOAD_H
> >  #define _MACH_XLOAD_H
> >  
> > -void *omap_xload_boot_nand(int offset, int size);
> > +void *omap_xload_boot_nand(int offset);
> >  void *omap_xload_boot_mmc(void);
> >  
> >  enum omap_boot_src {
> > diff --git a/arch/arm/mach-omap/xload.c b/arch/arm/mach-omap/xload.c
> > index 13024ab..d9765b7 100644
> > --- a/arch/arm/mach-omap/xload.c
> > +++ b/arch/arm/mach-omap/xload.c
> > @@ -7,16 +7,66 @@
> >  #include <fcntl.h>
> >  #include <mach/xload.h>
> >  #include <sizes.h>
> > +#include <asm/barebox-arm-head.h>
> >  
> > -void *omap_xload_boot_nand(int offset, int size)
> > +void *read_image_head(const char *name)
> >  {
> > +	void *header = xmalloc(ARM_HEAD_SIZE);
> > +	struct cdev *cdev;
> >  	int ret;
> > -	void *to = xmalloc(size);
> > +
> > +	cdev = cdev_open(name, O_RDONLY);
> > +	if (!cdev) {
> > +		printf("failed to open partition\n");
> > +		return NULL;
> > +	}
> > +
> > +	ret = cdev_read(cdev, header, ARM_HEAD_SIZE, 0, 0);
> > +	cdev_close(cdev);
> > +
> > +	if (ret != ARM_HEAD_SIZE) {
> > +		printf("failed to read from partition\n");
> > +		return NULL;
> > +	}
> > +
> > +	return header;
> > +}
> > +
> > +unsigned int get_image_size(void *head)
> > +{
> > +	unsigned int ret = 0;
> > +	unsigned int *psize = head + HEAD_SIZE_OFFSET;
> > +	const char *pmagic = head + HEAD_MAGICWORD_OFFSET;
> > +
> > +	if (!strcmp(pmagic, "barebox"))
> > +		ret = *psize;
> > +	debug("Detected barebox image size %u\n", ret);
> factorise the code with filetype
What exactly do you mean? I could factorise it by boot source (mmc / nand) with complete omap_xload_boot_nand.
Jan

> Best Regards,
> J.