[U-Boot] [PATCH v3] spl: net: Add FIT image support over network boot

[Andrew F. Davis]

On 04/07/2017 01:26 PM, Vignesh R wrote:
> 
> 
> On 4/7/2017 8:36 PM, Davis, Andrew wrote:
>> FIT support in the net boot case is much like the RAM boot case in that
>> we load our image to "load_addr" and pass a dummy read function into
>> "spl_load_simple_fit()". As the load address is no longer hard-coded to
>> the final execution address, RAW image loading will rely on "load_addr"
>> pointing to the execution address as they should have before.
>>
> 
> Sorry, but would you explain how network boot would work in case of non
> FIT image(same concern I had wrt v2)?
> 

Same as last time, the global 'load_addr' will need to be set correctly.
I guess we could also use the 'load_addr' provided by the legacy image
header then relocate the image. I'll add that for v4.

>> Signed-off-by: Andrew F. Davis <afd at ti.com>
>> ---
>>
>> Changes from v2:
>>  - Rebased on latest upstream/master
>>
>> Changes from v1:
>>  - move "spl_net_load_read" into #ifdef block as suggested by Vignesh
>>
>>  common/spl/spl_net.c | 30 +++++++++++++++++++++++++++---
>>  1 file changed, 27 insertions(+), 3 deletions(-)
>>
>> diff --git a/common/spl/spl_net.c b/common/spl/spl_net.c
>> index 0fba0172ea..3d1d05d833 100644
>> --- a/common/spl/spl_net.c
>> +++ b/common/spl/spl_net.c
>> @@ -11,19 +11,29 @@
>>  #include <errno.h>
>>  #include <spl.h>
>>  #include <net.h>
>> +#include <libfdt.h>
>>  
>>  DECLARE_GLOBAL_DATA_PTR;
>>  
>>  #if defined(CONFIG_SPL_ETH_SUPPORT) || defined(CONFIG_SPL_USBETH_SUPPORT)
>> +static ulong spl_net_load_read(struct spl_load_info *load, ulong sector,
>> +			       ulong count, void *buf)
>> +{
>> +	debug("%s: sector %lx, count %lx, buf %lx\n",
>> +	      __func__, sector, count, (ulong)buf);
>> +	memcpy(buf, (void *)(load_addr + sector), count);
>> +	return count;
>> +}
>> +
>>  static int spl_net_load_image(struct spl_image_info *spl_image,
>>  			      struct spl_boot_device *bootdev)
>>  {
>> +	struct image_header *header = (struct image_header *)load_addr;
>>  	int rv;
>>  
>>  	env_init();
>>  	env_relocate();
>>  	setenv("autoload", "yes");
>> -	load_addr = CONFIG_SYS_TEXT_BASE - sizeof(struct image_header);
>>  	rv = eth_initialize();
>>  	if (rv == 0) {
>>  		printf("No Ethernet devices found\n");
>> @@ -36,8 +46,22 @@ static int spl_net_load_image(struct spl_image_info *spl_image,
>>  		printf("Problem booting with BOOTP\n");
>>  		return rv;
>>  	}
>> -	return spl_parse_image_header(spl_image,
>> -				      (struct image_header *)load_addr);
>> +
>> +	if (IS_ENABLED(CONFIG_SPL_LOAD_FIT) &&
>> +	    image_get_magic(header) == FDT_MAGIC) {
>> +		struct spl_load_info load;
>> +
>> +		debug("Found FIT\n");
>> +		load.bl_len = 1;
>> +		load.read = spl_net_load_read;
>> +		rv = spl_load_simple_fit(spl_image, &load, 0, header);
>> +	} else {
>> +		debug("Legacy image\n");
>> +
>> +		rv = spl_parse_image_header(spl_image, header);
>> +	}
>> +
>> +	return rv;
>>  }
>>  #endif
>>  
>>