diff options
| author | Anup Patel <anup@brainfault.org> | 2018-11-12 06:55:15 +0100 |
|---|---|---|
| committer | Palmer Dabbelt <palmer@sifive.com> | 2018-11-20 14:19:09 +0100 |
| commit | c0fbcd9918607e85c9598bfa3dd0a84ed77ea210 (patch) | |
| tree | 5e88da40c8c0781e1dd6417123ead07ba47ceabd /arch/riscv/kernel/head.S | |
| parent | RISC-V: Fix raw_copy_{to,from}_user() (diff) | |
| download | linux-c0fbcd9918607e85c9598bfa3dd0a84ed77ea210.tar.xz linux-c0fbcd9918607e85c9598bfa3dd0a84ed77ea210.zip | |
RISC-V: Build flat and compressed kernel images
This patch extends Linux RISC-V build system to build and install:
Image - Flat uncompressed kernel image
Image.gz - Flat and GZip compressed kernel image
Quiet a few bootloaders (such as Uboot, UEFI, etc) are capable of
booting flat and compressed kernel images. In case of Uboot, booting
Image or Image.gz is achieved using bootm command.
The flat and uncompressed kernel image (i.e. Image) is very useful
in pre-silicon developent and testing because we can create back-door
HEX files for RAM on FPGAs from Image.
Signed-off-by: Anup Patel <anup@brainfault.org>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
Diffstat (limited to 'arch/riscv/kernel/head.S')
| -rw-r--r-- | arch/riscv/kernel/head.S | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/riscv/kernel/head.S b/arch/riscv/kernel/head.S index 711190d473d4..fe884cd69abd 100644 --- a/arch/riscv/kernel/head.S +++ b/arch/riscv/kernel/head.S @@ -44,6 +44,16 @@ ENTRY(_start) amoadd.w a3, a2, (a3) bnez a3, .Lsecondary_start + /* Clear BSS for flat non-ELF images */ + la a3, __bss_start + la a4, __bss_stop + ble a4, a3, clear_bss_done +clear_bss: + REG_S zero, (a3) + add a3, a3, RISCV_SZPTR + blt a3, a4, clear_bss +clear_bss_done: + /* Save hart ID and DTB physical address */ mv s0, a0 mv s1, a1 |