[LS1046] smc_call cannot get the correct result

linxx — Mon, 21 Mar 2022 05:20:25 GMT

I'm confused about the smc_call, the regs[1] printed was always ffffffff when running the tfa_get_dram_size() routine cited from u-boot in flexbuild_lsdk2108,

it's also the case when regs0]=SMC_DRAM_BANK_INFO

Is there any precondition ( for CPU or SDRAM) should be mentioned when using smc_call?

phys_size_t tfa_get_dram_size(void)

{

struct pt_regs regs;

phys_size_t dram_size = 0;

regs.regs[0] = SMC_DRAM_BANK_INFO;

regs.regs[1] = -1;

smc_call(&regs);

if (regs.regs[0])

return 0;

printf("regs[0]=%x regs[1]=%x\n",regs.regs[0],regs.regs[1]);

dram_size = regs.regs[1];

return dram_size;

}

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[LS1046] smc_call cannot get the correct result