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fel: only read MMU control registers if MMU is enabled

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This workaround is necessary for A80, which sometimes
fails at reading DACR.

Signed-off-by: Jens Kuske <jenskuske@gmail.com>
Reviewed-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>
This commit is contained in:
Jens Kuske 2016-03-21 14:24:14 +01:00 committed by Siarhei Siamashka
parent 472ac4759d
commit 035167cb14
1 changed files with 5 additions and 4 deletions
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9
fel.c
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@ -767,10 +767,7 @@ uint32_t *aw_backup_and_disable_mmu(libusb_device_handle *usb,
soc_sram_info *sram_info)
{
uint32_t *tt = NULL;
uint32_t ttbr0 = aw_get_ttbr0(usb, sram_info);
uint32_t sctlr = aw_get_sctlr(usb, sram_info);
uint32_t ttbcr = aw_get_ttbcr(usb, sram_info);
uint32_t dacr = aw_get_dacr(usb, sram_info);
uint32_t sctlr, ttbr0, ttbcr, dacr;
uint32_t i;
uint32_t arm_code[] = {
@ -796,6 +793,7 @@ uint32_t *aw_backup_and_disable_mmu(libusb_device_handle *usb,
*/
/* Basically, ignore M/Z/I bits and expect no TEX remap */
sctlr = aw_get_sctlr(usb, sram_info);
if ((sctlr & ~((1 << 12) | (1 << 11) | 1)) != 0x00C52078) {
fprintf(stderr, "Unexpected SCTLR (%08X)\n", sctlr);
exit(1);
@ -806,16 +804,19 @@ uint32_t *aw_backup_and_disable_mmu(libusb_device_handle *usb,
return NULL;
}
dacr = aw_get_dacr(usb, sram_info);
if (dacr != 0x55555555) {
fprintf(stderr, "Unexpected DACR (%08X)\n", dacr);
exit(1);
}
ttbcr = aw_get_ttbcr(usb, sram_info);
if (ttbcr != 0x00000000) {
fprintf(stderr, "Unexpected TTBCR (%08X)\n", ttbcr);
exit(1);
}
ttbr0 = aw_get_ttbr0(usb, sram_info);
if (ttbr0 & 0x3FFF) {
fprintf(stderr, "Unexpected TTBR0 (%08X)\n", ttbr0);
exit(1);