22 lines
875 B
Markdown
22 lines
875 B
Markdown
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## Use more than 1 CPU
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With only 1 CPU some thigs are soo slow to work. For example, the ttyS0 device
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doesn't arrive on time and the login fails. Or the SSH daemon doesn't start
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until the third try. With -smp 32 seems to work ok.
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## Compressed instructions
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To see if a binary has compressed instructions or not, you can use objdump:
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hut% nix shell -vL nixpkgs#pkgsCross.riscv64.bintools
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hut% objdump -M no-aliases -D result/u-boot | grep 'c\.' | head -5
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80200000: 822a c.mv tp,a0
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80200002: 84ae c.mv s1,a1
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80200018: 52c1 c.li t0,-16
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8020001e: 0356 c.slli t1,0x15
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80200024: 850a c.mv a0,sp
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To dump a ROM without the ELF header:
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hut% objdump -b binary -m riscv:rv64 -M no-aliases -D result/u-boot.bin
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