samsung-a5: fb_convert_to_xrgb8888 causes data fault

[samcday]

When booting U-Boot with lk2nd.pass-simplefb=uboot command line, the following exception is triggered in lk2nd:

[670] simplefb: switching to xrgb888 because u-boot can't do 24
[720] data abort
[720] translation fault on write
[720] DFAR 0x8e300000 (fault address)
[720] DFSR 0x805 (fault status register)
[730] data abort, halting
[730] r0  0x8e300000 r1  0x90300020 r2  0x00083fc0 r3  0x1e000000
[740] r4  0xbf000000 r5  0x00000000 r6  0x00000000 r7  0x00000000
[740] r8  0x33000000 r9  0x01000000 r10 0x00000000 r11 0x00000000
[750] r12 0x01a15000 usp 0x00000000 ulr 0x00000000 pc  0x8f6213a0
[750] spsr 0x20000153
[760]  fiq r13 0x8f649000 r14 0x864001b8
[760]  irq r13 0x8f655260 r14 0x8f60ca28
[760] *svc r13 0x8f684d00 r14 0x8f62b334
[770]  und r13 0x8f649000 r14 0xffbce774
[770]  sys r13 0x00000000 r14 0x00000000
[770] bottom of stack at 0x8f684d00:
0x8f684d00: 8f67ee14 81e00000 8f644100 8f644140 |..g......Ad..Ad.|
0x8f684d10: 00000000 00000000 8e000000 8f67ee14 |..............g.|
0x8f684d20: 90000000 8f62b334 8f68dd84 4b3f9c01 |......b...h....K|
0x8f684d30: 8f63eb04 00000001 8f68dd84 8f62afdc |..c.......h...b.|
0x8f684d40: 0000c704 4b3f9c01 0000c6e8 81e00000 |.......K........|
0x8f684d50: 81e0c724 6f6f6275 81e00074 ffffffff |....uboot.......|
0x8f684d60: 00000015 4b3f9c01 8f63af89 8f63af81 |.......K..c...c.|
0x8f684d70: 8f63af89 00001d64 81e00000 8f623200 |..c.d.........b.|

$ addr2line -e build-lk2nd-msm8916/lk 0x8f6213a0
/var/home/sam/src/lk2nd/lib/libc/string/arch/arm/memcpy.S:87

Manually commenting out mdp_set_xrgb8888 and instead using mdp_set_rgb565 does work.

[exkc]

j5x might have the same issue. uboot initially failed to boot due to #3 . i worked around that by dumping all the file in thirdstage.ext2 into system. After that it started to bootloop thus i tried do smailer thing as above . it stoped boot looping after that but uboot console didnt show up on the sceen and i dont have other way verify uboot boot

[TravMurav]

Hi! At some point I've updated lk2nd to allow framebuffer relocation, but unfortunately I didn't have time to update this repo yet to build latest versions of lk2nd and u-boot yet. I believe you should be able to build it with latest lk2nd and update cmdline with new value:

gen-uboot-img/extlinux/extlinux.conf

Line 7 in f478d92

append lk2nd.pass-ramoops=zap lk2nd.pass-simplefb=uboot

should be changed to use lk2nd.pass-simplefb=xrgb8888,relocate

[exkc]

alr i builded the lastest uboot and latest main branches of lk2nd with patches from rebase/hl (bc of qhypstub (see msm8916-mainline/lk2nd#414) ) and it booted pm os that on the sdcard but the screen went black when the phone is in uboot ( linux did trun the screen on after uboot booted linux via efi)