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rockchip: mkimage: clarify header0 initialisation

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This change set adds documentation to the header0 initialisation and
improves readability for the calculations of various offsets/lengths.

As the U-Boot SPL stage doesn't use any payload beyond what is covered
by init_size, we no longer add RK_MAX_BOOT_SIZE to init_boot_size.

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Acked-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Philipp Tomsich 2017-04-17 17:48:04 +02:00 committed by Simon Glass
parent c25b8c3af1
commit a1a2dfb870
1 changed files with 17 additions and 3 deletions
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20
tools/rkcommon.c
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@ -13,6 +13,8 @@
#include "mkimage.h"
#include "rkcommon.h"
#define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
enum {
RK_SIGNATURE = 0x0ff0aa55,
};
@ -160,9 +162,21 @@ static void rkcommon_set_header0(void *buf, uint file_size,
hdr->disable_rc4 = !rkcommon_need_rc4_spl(params);
hdr->init_offset = RK_INIT_OFFSET;
hdr->init_size = (file_size + RK_BLK_SIZE - 1) / RK_BLK_SIZE;
hdr->init_size = (hdr->init_size + 3) & ~3;
hdr->init_boot_size = hdr->init_size + RK_MAX_BOOT_SIZE / RK_BLK_SIZE;
hdr->init_size = DIV_ROUND_UP(file_size, RK_BLK_SIZE);
/*
* The init_size has to be a multiple of 4 blocks (i.e. of 2K)
* or the BootROM will not boot the image.
*
* Note: To verify that this is not a legacy constraint, we
* rechecked this against the RK3399 BootROM.
*/
hdr->init_size = ROUND(hdr->init_size, 4);
/*
* The images we create do not contain the stage following the SPL as
* part of the SPL image, so the init_boot_size (which might have been
* read by Rockchip's miniloder) should be the same as the init_size.
*/
hdr->init_boot_size = hdr->init_size;
rc4_encode(buf, RK_BLK_SIZE, rc4_key);
}