Am 2014-04-16 15:17, schrieb Stefan Agner:
Hi Stefano,
Am 2014-04-16 17:44, schrieb Stefano Babic:
On 16/04/2014 15:29, stefan@agner.ch wrote:
From: Stefan Agner stefan@agner.ch
The i.MX V2 headers total size is 0x7fc. The header is placed in front of the U-Boot binary which of course is aligned to text base. Hence the header starting point is not page aligned (e.g. at 0x3f400404). This is still a valid header, which boots fine using serial loader. However, the image fails to boot from NAND (tested on a VF61x SoC).
Can you better explain this ? There is only one board in mainline with vf610. CONFIG_SYS_TEXT_BASE is set to 0x3f008000. I cannot get the offset in your example. Are you referring to NAND page ? But if the header must be aligned with the NAND page, this is pretty bad because we have to adjust the header depending on the selected NAND chip. I do not see this limitation in the manual.
I've not submitted my board yet, I altered it to use 0x3f400800 as CONFIG_SYS_TEXT_BASE. I just realize that a header length of 0x7fc doesn't fit with 0x3f400404 even though (that would be 0x3f400004 if anything). But the mkimage utility reports Load Address: 3f400420 Entry Point: 3f400800 I'm a bit confused now, why is the header only 0x400 now?
Ok I checked this again, the header total size is _not_ 0x7fc, thats imximage_init_loadsize, which is the header size + flash load size (0x400 for NAND).
The header total size is 0x3fc (sizeof(imx_header_v2_t)) right now. This patch would make alter it to be exactly 0x400.
In case this discussion ends up adding this padding word, I will send a new patch with correct numbers and better description.