[PATCH v3] common: fdt: Remove additional 4k space for fdt allocation

[Michal Simek]

From: Ashok Reddy Soma <ashok.reddy.soma at xilinx.com>

There is no technical reason to add additional 4k space for FDT. This space
is completely unused and just increase memory requirements. This is
problematic on systems with limited memory resources as Xilinx Zynq
CSE/ZynqMP mini and Versal mini configurations.

The patch is removing additional 4k space.

EFI code is using copy_fdt() which copy FDT to different location.
And all boot commands in case of using U-Boot's FDT pointed by
$fdtcontroladdr are copying FDT to different locations by
image_setup_libfdt().
That's why in proper flow none should modified DTB used by U-Boot that's
why there is no need for additional space.

Signed-off-by: Ashok Reddy Soma <ashok.reddy.soma at xilinx.com>
Signed-off-by: Michal Simek <michal.simek at xilinx.com>
---

Changes in v3:
- Remove alignment change and keep it as 32

Changes in v2:
- Change subject (was: common: Add Kconfig option for FDT mem alignment)
- Remove Kconfig symbol
- Extend description

I have tested it on zcu104.
Outcome from v2 review was to remove that alignment part and if that works
on all boards then it is ready to go. The best as early as possible.

Tom: Would be good to add it to your queue for testing to spot any issue
earlier.

---
 common/board_f.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/common/board_f.c b/common/board_f.c
index 01194eaa0e4d..dcad551ae434 100644
--- a/common/board_f.c
+++ b/common/board_f.c
@@ -537,7 +537,7 @@ static int reserve_fdt(void)
 	 * will be relocated with other data.
 	 */
 	if (gd->fdt_blob) {
-		gd->fdt_size = ALIGN(fdt_totalsize(gd->fdt_blob) + 0x1000, 32);
+		gd->fdt_size = ALIGN(fdt_totalsize(gd->fdt_blob), 32);
 
 		gd->start_addr_sp = reserve_stack_aligned(gd->fdt_size);
 		gd->new_fdt = map_sysmem(gd->start_addr_sp, gd->fdt_size);
-- 
2.27.0