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authorBin Meng <bin.meng@windriver.com>2020-06-15 17:50:39 -0700
committerAlistair Francis <alistair.francis@wdc.com>2020-06-19 08:25:27 -0700
commit17aad9f276953c1eaf0750faf4758fd2f5ebeb84 (patch)
tree137c0da55fcfbafe070b5caad002a3418609482d /include
parent495134b75cca3e6a34d4233113c5143439061771 (diff)
hw/riscv: sifive_u: Support different boot source per MSEL pin state
SiFive FU540 SoC supports booting from several sources, which are controlled using the Mode Select (MSEL[3:0]) pins on the chip. Typically, the boot process runs through several stages before it begins execution of user-provided programs. The SoC supports booting from memory-mapped QSPI flash, which is how start_in_flash property is used for at present. This matches MSEL = 1 configuration (QSPI0). Typical booting flows involve the Zeroth Stage Boot Loader (ZSBL). It's not necessary for QEMU to implement the full ZSBL ROM codes, because we know ZSBL downloads the next stage program into the L2 LIM at address 0x8000000 and executes from there. We can bypass the whole ZSBL execution and use "-bios" to load the next stage program directly if MSEL indicates a ZSBL booting flow. Signed-off-by: Bin Meng <bin.meng@windriver.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Message-id: 1592268641-7478-4-git-send-email-bmeng.cn@gmail.com Message-Id: <1592268641-7478-4-git-send-email-bmeng.cn@gmail.com> Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Diffstat (limited to 'include')
-rw-r--r--include/hw/riscv/sifive_u.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/hw/riscv/sifive_u.h b/include/hw/riscv/sifive_u.h
index f6d10ebfb6..27dc35e0a3 100644
--- a/include/hw/riscv/sifive_u.h
+++ b/include/hw/riscv/sifive_u.h
@@ -111,6 +111,12 @@ enum {
SIFIVE_U_RTCCLK_FREQ = 1000000
};
+enum {
+ MSEL_MEMMAP_QSPI0_FLASH = 1,
+ MSEL_L2LIM_QSPI0_FLASH = 6,
+ MSEL_L2LIM_QSPI2_SD = 11
+};
+
#define SIFIVE_U_MANAGEMENT_CPU_COUNT 1
#define SIFIVE_U_COMPUTE_CPU_COUNT 4