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| author | Rick Chen <rick@andestech.com> | 2018-03-29 10:08:33 +0800 |
|---|---|---|
| committer | Andes <uboot@andestech.com> | 2018-03-30 13:13:56 +0800 |
| commit | d58717e42559189a226ea800173147399c8edef9 (patch) | |
| tree | a94bffe91400f0486571454a3db56733899c4c7e /arch/riscv | |
| parent | 2bc5bea9e160c7efe5a268a55b440ac8cf848b48 (diff) | |
| download | u-boot-d58717e42559189a226ea800173147399c8edef9.tar.gz u-boot-d58717e42559189a226ea800173147399c8edef9.tar.xz u-boot-d58717e42559189a226ea800173147399c8edef9.zip | |
riscv: ae250: Support DT provided by the board at runtime
Enable CONFIG_OF_BOAD to support delivery dtb to u-boot
at run time instead of embedded.
There are two methods to delivery dtb.
1 Pass from loader:
When u-boot boot from RAM, gdb or loader can pass dtb
via a2 to u-boot dynamically. Of course gdb or loader
shall be in charge of dtb delivery.
2 Configure CONFIG_SYS_FDT_BASE:
It can be configured as RAM or ROM base statically,
no mater u-boot boot from RAM or ROM.
If it was configured as ROM base, dtb can be burned
into ROM(spi flash) by spi driver.
Meanwhile remove CONFIG_SKIP_LOWLEVEL_INIT which is
useless in nx25-ae250 configuration.
Signed-off-by: Rick Chen <rick@andestech.com>
Signed-off-by: Rick Chen <rickchen36@gmail.com>
Cc: Greentime Hu <green.hu@gmail.com>
Diffstat (limited to 'arch/riscv')
| -rw-r--r-- | arch/riscv/cpu/nx25/start.S | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/riscv/cpu/nx25/start.S b/arch/riscv/cpu/nx25/start.S index 6a076639d3..cd0a66360d 100644 --- a/arch/riscv/cpu/nx25/start.S +++ b/arch/riscv/cpu/nx25/start.S @@ -45,6 +45,8 @@ trap_vector: .global trap_entry handle_reset: + li t0, CONFIG_SYS_SDRAM_BASE + SREG a2, 0(t0) la t0, trap_entry csrw mtvec, t0 csrwi mstatus, 0 |