On 1/20/19 12:34 PM, Auer, Lukas wrote:
Hi Anup,
On Fri, 2019-01-18 at 11:18 +0000, Anup Patel wrote:
This patchset adds SiFive Freedom Unleashed (FU540) support
to RISC-V U-Boot.
The patches are based upon latest RISC-V U-Boot tree
(git://git.denx.de/u-boot-riscv.git) at commit id
91882c472d8c0aef4db699d3f2de55bf43d4ae4b
All drivers namely: SiFive PRCI, SiFive Serial, and Cadance
MACB Ethernet work fine on actual SiFive Unleashed board and
QEMU sifive_u machine.
Thanks for working on this! Are you also planning on adding the
features of the FSBL to U-Boot to remove it from the boot flow?
That would also mean that adding M-mode capability in U-boot. As of now
the expected boot flow is
ZSBL->FSBL------->BBL/OpenSBI--------->U-boot------------->Linux
(M mode from ROM) (M mode from DRAM) (S Mode from DRAM) (S Mode from
DRAM)
This is not the mandated boot flow but running the last stage boot
loader from S-mode gives flexibility in virtualization in future.
I was able to run U-Boot and boot Linux successfully on a SiFive HiFive
Unleashed board with this patch series. I had to make one more change,
because U-Boot was not able to find a serial driver and paniced as a
result.
I fixed this by making the serial driver available pre-relocation. For
this, the soc compatible has to be added to cpu/generic/cpu.c and the
serial driver must have the DM_FLAG_PRE_RELOC flag set.
Another way would be to add a "stdout-path" property to the chosen node
of the device tree.
Currently, we modified the DT to add stdout-path in prior stage boot loader.
Regards,
Atish
Thanks,
Lukas
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