Instead of placing FDT (passed by previous booting stage) at a
location relative to next address we should have absolute
location of placing FDT so that we more freedom of placing FDT.

This will be particularly useful for platforms/boards with
very less RAM (such as Kendryte board).

Due to above motivation, we rename FW_xyz_FDT_OFFSET options
to FW_xyz_FDT_ADDR options and use FW_xyz_FDT_ADDR options as
absolute address for placing FDT.

Signed-off-by: Anup Patel <anup.patel@wdc.com>

The PLAT_TEXT_START is only used by our firmware blobs hence
rename it to FW_TEXT_START.

Signed-off-by: Anup Patel <anup.patel@wdc.com>

This patch remove hard-coding of payload location in
fw_payload.elf.ldS by adding compile-time option
FW_PAYLOAD_OFFSET.

With the new compile-time option, payload will be placed
at PLAT_TEXT_START + FW_PAYLOAD_OFFSET address.

Signed-off-by: Anup Patel <anup.patel@wdc.com>

Various typos fix.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>

Currently, we aggresively use atomic operation on CLINT IPI
register. This patch simplify CLINT IPI APIs by reducing use
of atomic operations. In future, we will gradually increase
use of atomic operations for CLINT IPI APIs.

Signed-off-by: Anup Patel <anup.patel@wdc.com>

The QEMU sifive_u machine is not excatly same as HiFive Unleashed
board hence we add separate platform support for QEMU sifive_u
machine.

Signed-off-by: Anup Patel <anup.patel@wdc.com>

Emulation of CSR read for misa and mhartid was a workaround for
bootloader accessing these CSRs in S-mode. This patch removes
CSR read emulation for misa and mhartid.

Signed-off-by: Anup Patel <anup.patel@wdc.com>

Signed-off-by: Anup Patel <anup.patel@wdc.com>