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platform: generic: Keep some empty space in FDT passed to next stage

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Leaving no empty space in the FDT passed to the next booting stage
causes the following U-Boot crash on Ventana internal platforms:

Unhandled exception: Load access fault
EPC: 00000000fffa6372 RA: 00000000fffa7418 TVAL: 0001746174730068
EPC: 0000000080245372 RA: 0000000080246418 reloc adjusted

SP:  00000000fef38440 GP:  00000000fef40e60 TP:  0000000000000000
T0:  00000000fef40a70 T1:  000000000000ff00 T2:  0000000000000000
S0:  00000000fffc17a8 S1:  00000000fef38d40 A0:  7375746174730068
A1:  00000000fffc17a8 A2:  0000000000000010 A3:  0000000000000010
A4:  0000000000000000 A5:  00000000fffc17b8 A6:  0000000000ff0000
A7:  000000000000b100 S2:  0000000000000000 S3:  0000000000000001
S4:  00000000fef38d40 S5:  7375746174730068 S6:  0000000000000000
S7:  00000000fef4eef0 S8:  00000000fef4ef90 S9:  0000000000000000
S10: 0000000000000000 S11: 00000000fef4efc0 T3:  00000000fef40ea8
T4:  0000000000ff0000 T5:  00000000fef40a60 T6:  00000000fef40a6c

To address the above issue, keep some minimal empty space in the
FDT instead of no empty space.

Fixes: bbe9a23060 ("platform: generic: Pack the FDT after applying fixups")
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Link: https://lore.kernel.org/r/20251209053130.407935-1-apatel@ventanamicro.com
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Anup Patel
2025-12-09 11:01:30 +05:30
committed by Anup Patel
parent afc24152bb
commit 4339e85794
2 changed files with 8 additions and 0 deletions
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5
platform/generic/Kconfig
View File

@@ -23,6 +23,11 @@ config PLATFORM_GENERIC_MINOR_VER
range 0 65535 range 0 65535
default 1 default 1
config PLATFORM_GENERIC_FDT_EMPTY_SPACE
int "Platform FDT empty space (KB)"
range 0 1024
default 4
config PLATFORM_ALLWINNER_D1 config PLATFORM_ALLWINNER_D1
bool "Allwinner D1 support" bool "Allwinner D1 support"
depends on FDT_IRQCHIP_PLIC depends on FDT_IRQCHIP_PLIC

3
platform/generic/platform.c
View File

@@ -245,7 +245,10 @@ int generic_final_init(bool cold_boot)
fdt_fixups(fdt); fdt_fixups(fdt);
fdt_domain_fixup(fdt); fdt_domain_fixup(fdt);
/* Set the empty space in FDT based on kconfig option */
fdt_pack(fdt); fdt_pack(fdt);
fdt_open_into(fdt, fdt, fdt_totalsize(fdt) +
CONFIG_PLATFORM_GENERIC_FDT_EMPTY_SPACE * 1024);
return 0; return 0;
} }