Djam/u-boot
1
0
Fork 0
mirror of https://github.com/u-boot/u-boot.git synced 2025-05-09 03:21:51 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

lib: fdtdec: Add function re-setup the fdt more effeciently

Browse source 
In some cases it may be useful to be able to change the fdt we have been
using and use another one instead. For example, the TI platforms uses an
EEPROM to store board information and, based on the type of board,
different dtbs are used by the SPL. When DM_I2C is used, a first dtb must
be used before the I2C is initialized and only then the final dtb can be
selected.
To speed up the process and reduce memory usage, introduce a new function
fdtdec_setup_best_match() that re-use the DTBs loaded in memory by
fdtdec_setup() to select the best match.

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
This commit is contained in:
Jean-Jacques Hiblot 2018-12-07 14:50:52 +01:00 • committed by Heiko Schocher
parent 78eee5e90d
commit f1d2bc9034
4 changed files with 85 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

43
lib/fdtdec.c
View file

@ -1275,14 +1275,55 @@ int fdtdec_setup(void)
* If so, pick the most relevant
*/
fdt_blob = locate_dtb_in_fit(gd->fdt_blob);
if (fdt_blob)
if (fdt_blob) {
gd->multi_dtb_fit = gd->fdt_blob;
gd->fdt_blob = fdt_blob;
}
# endif
#endif
return fdtdec_prepare_fdt();
}
#if CONFIG_IS_ENABLED(MULTI_DTB_FIT)
int fdtdec_resetup(int *rescan)
{
void *fdt_blob;
/*
* If the current DTB is part of a compressed FIT image,
* try to locate the best match from the uncompressed
* FIT image stillpresent there. Save the time and space
* required to uncompress it again.
*/
if (gd->multi_dtb_fit) {
fdt_blob = locate_dtb_in_fit(gd->multi_dtb_fit);
if (fdt_blob == gd->fdt_blob) {
/*
* The best match did not change. no need to tear down
* the DM and rescan the fdt.
*/
*rescan = 0;
return 0;
}
*rescan = 1;
gd->fdt_blob = fdt_blob;
return fdtdec_prepare_fdt();
}
/*
* If multi_dtb_fit is NULL, it means that blob appended to u-boot is
* not a FIT image containings DTB, but a single DTB. There is no need
* to teard down DM and rescan the DT in this case.
*/
*rescan = 0;
return 0;
}
#endif
#ifdef CONFIG_NR_DRAM_BANKS
int fdtdec_decode_ram_size(const void *blob, const char *area, int board_id,
phys_addr_t *basep, phys_size_t *sizep, bd_t *bd)