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xilinx: Handle board_get_usable_ram_top(0) properly

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board_get_usable_ram_top() was designed for getting the top most location
for U-Boot allocation that's why function itself supports via total_size
parameter to find out where the right location for U-Boot is.
But function itself is also reused by different (EFI) which is passing
total_size as 0 to find out where the usable ram top is. For this case
doesn't make sense (a waste time) to call any lmb functions.
That's why simply return gd->ram_top.

And gd->ram_top is filled already based on previous call for U-Boot iself.
The same solution is also used by stm32mp by commit 92b611e8b0 ("stm32mp:
correctly handle board_get_usable_ram_top(0)") and commit c8510e397f
("stm32mp: Fix board_get_usable_ram_top()").

Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/44470619e74f3e480b70deac24578e3e0d5c907e.1651225945.git.michal.simek@amd.com
This commit is contained in:
Michal Simek 2022-04-29 11:52:27 +02:00 committed by Michal Simek
parent 303198e26d
commit 9c563e916c
2 changed files with 6 additions and 0 deletions
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3
board/xilinx/versal/board.c
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@ -256,6 +256,9 @@ ulong board_get_usable_ram_top(ulong total_size)
phys_addr_t reg;
struct lmb lmb;
if (!total_size)
return gd->ram_top;
/* found enough not-reserved memory to relocated U-Boot */
lmb_init(&lmb);
lmb_add(&lmb, gd->ram_base, gd->ram_size);

3
board/xilinx/zynqmp/zynqmp.c
View file

@ -516,6 +516,9 @@ ulong board_get_usable_ram_top(ulong total_size)
phys_addr_t reg;
struct lmb lmb;
if (!total_size)
return gd->ram_top;
if (!IS_ALIGNED((ulong)gd->fdt_blob, 0x8))
panic("Not 64bit aligned DT location: %p\n", gd->fdt_blob);