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riscv: ae250: Support DT provided by the board at runtime

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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>
This commit is contained in:
Rick Chen
2018-03-29 10:08:33 +08:00
committed by Andes
parent 2bc5bea9e1
commit d58717e425
4 changed files with 15 additions and 9 deletions
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2
arch/riscv/cpu/nx25/start.S
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@@ -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