• Peter Griffin's avatar
    ARM: STi: Add code to release secondary cores from holding pen. · 94a8cfce
    Peter Griffin authored
    Most upstream devs boot STi platform via JTAG which abuses the
    boot process by setting the PC of secondary cores directly. As
    a consquence, booting STi platforms via u-boot results in only
    the primary core being brought up as the code to manage the
    holding pen is not upstream.
    
    This patch adds the necessary code to bring the secondary cores
    out of the holding pen. It uses the cpu-release-addr DT property
    to get the address of the holding pen from the bootloader.
    
    With this patch booting upstream kernels via u-boot works
    correctly:
    
    [    0.045456] CPU: Testing write buffer coherency: ok
    [    0.045597] CPU0: thread -1, cpu 0, socket 0, mpidr 80000000
    [    0.045734] Setting up static identity map for 0x40209000 - 0x40209098
    [    0.065047] CPU1: thread -1, cpu 1, socket 0, mpidr 80000001
    [    0.065081] Brought up 2 CPUs
    [    0.065089] SMP: Total of 2 processors activated (5983.43 BogoMIPS).
    [    0.065092] CPU: All CPU(s) started in SVC mode.
    Signed-off-by: default avatarPeter Griffin <peter.griffin@linaro.org>
    Acked-by: default avatarMaxime Coquelin <maxime.coquelin@st.com>
    Signed-off-by: default avatarMaxime Coquelin <maxime.coquelin@st.com>
    94a8cfce
headsmp.S 1.01 KB