[OpenWrt-Devel] [PATCH] ath79: switch to kernel 5.4
ynezz at true.cz
Wed Jul 1 11:36:12 EDT 2020
Hauke Mehrtens <hauke at hauke-m.de> [2020-06-29 00:29:22]:
> This is set in the configure_status() function:
> But I think this is not working correctly under some unknown conditions.
> I printed the read_c0_status() in the do_dsp() function and when this
> exception occurs the DSPEn bit is *not* set.
maybe it's due to the following:
status_set |= ST0_MX;
> Does someone see a bug in the broken version?
> In this line:
> 4c: 40826000 mtc0 v0,c0_status
> in v0 the following bits should be set:
Seems to be alright:
> #define ST0_MX 0x01000000
2c: 3c040100 lui a0,0x100 << 16 = 0x01000000
> #define ST0_CU0 0x10000000
8: 3c051000 lui a1,0x1000 << 16 = 0x10000000
I think, that the problem is here, as the ST0_MX bit is set conditionally:
20: 30630010 andi v1,v1,0x10
24: 10600003 beqz v1,34 <configure_status+0x34>
if (cpu_data.ases & 0x10) // 0x10 = MIPS_ASE_DSP
#define MIPS_ASE_DSP 0x00000010
#define cpu_has_dsp __ase(MIPS_ASE_DSP)
#define __ase(ase) (cpu_data.ases & (ase))
and then status_set doesn't have ST0_MX bit set? Just printk the status_set.
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