Eric Lee / smarc-uboot

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Commit 8176ea4d58d18740e344dd4b587433c9f7772ac1

Authored by Lukas Auer
Committed by Andes
1 parent 1f2e948d6d
Exists in smarc_8mq_lf_v2020.04 and in 11 other branches 8qm-imx_v2020.04_5.4.70_2.3.0, emb_lf_v2022.04, pitx_8mp_lf_v2020.04, smarc-8m-android-10.0.0_2.6.0, smarc-8m-android-11.0.0_2.0.0, smarc-8mp-android-11.0.0_2.0.0, smarc_8m-imx_v2019.04_4.19.35_1.1.0, smarc_8mm-imx_v2019.04_4.19.35_1.1.0, smarc_8mm-imx_v2020.04_5.4.24_2.1.0, smarc_8mp_lf_v2020.04, smarc_8mq-imx_v2020.04_5.4.24_2.1.0

riscv: add Kconfig entries for the code model 

RISC-V has two code models, medium low (medlow) and medium any (medany).
Medlow limits addressable memory to a single 2 GiB range between the
absolute addresses -2 GiB and +2 GiB. Medany limits addressable memory
to any single 2 GiB address range.

By default, medlow is selected for U-Boot on both 32-bit and 64-bit
systems.

The -mcmodel compiler flag is selected according to the Kconfig
configuration.

Signed-off-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
[bmeng: adjust to make medlow the default code model for U-Boot]
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Anup Patel <anup@brainfault.org>

Showing 2 changed files with 26 additions and 1 deletions Side-by-side Diff

... ... @@ -44,6 +44,24 @@
44 44  
45 45 endchoice
46 46  
  47 +choice
  48 + prompt "Code Model"
  49 + default CMODEL_MEDLOW
  50 +
  51 +config CMODEL_MEDLOW
  52 + bool "medium low code model"
  53 + help
  54 + U-Boot and its statically defined symbols must lie within a single 2 GiB
  55 + address range and must lie between absolute addresses -2 GiB and +2 GiB.
  56 +
  57 +config CMODEL_MEDANY
  58 + bool "medium any code model"
  59 + help
  60 + U-Boot and its statically defined symbols must be within any single 2 GiB
  61 + address range.
  62 +
  63 +endchoice
  64 +
47 65 config RISCV_ISA_C
48 66 bool "Emit compressed instructions"
49 67 default y
... ... @@ -17,8 +17,15 @@
17 17 ifeq ($(CONFIG_RISCV_ISA_C),y)
18 18 ARCH_C = c
19 19 endif
  20 +ifeq ($(CONFIG_CMODEL_MEDLOW),y)
  21 + CMODEL = medlow
  22 +endif
  23 +ifeq ($(CONFIG_CMODEL_MEDANY),y)
  24 + CMODEL = medany
  25 +endif
20 26  
21   -ARCH_FLAGS = -march=$(ARCH_BASE)$(ARCH_A)$(ARCH_C) -mabi=$(ABI)
  27 +ARCH_FLAGS = -march=$(ARCH_BASE)$(ARCH_A)$(ARCH_C) -mabi=$(ABI) \
  28 + -mcmodel=$(CMODEL)
22 29  
23 30 PLATFORM_CPPFLAGS += $(ARCH_FLAGS)
24 31 CFLAGS_EFI += $(ARCH_FLAGS)