Guus Jansman

Of course my question came just before I had some progress. I see /dev/mmcblk1 now! I just used some wrong diskimage (I think, I'll have to check). It is not very stable now, maybe due wrong content or timing. Another thing I have to find out. But you may ignore my questions for now. Sorry for the noise. An the next step will be difficult. I want to boot from the eMMC. No idea whether this is really possible but that's what I really want to do. There is a possibility that I'll ask questions about this. I'll try to be more thorough then. I forgot to mention: Using the fex file I misuse a GPIO pin to simulate an SD DETECT line. That's how I can at least boot Linux and it gives me some possibility to check what's happening. Guus

First a very big "Thank you", Igor. You create wonderful images. But now the problem. I want to boot the A20 from an eMMC Flash. I use a HAOYU New MarsBoard A20 Dev Board. The reason: the CM-A10/A20 PCB has a footprint for an eMMC. So the 8GB NAND was removed and replaced by a 2GB eMMC. Then I took the Pecovnik Olimex Lime2 Jessie 3.4.108 image and added the fex file from the MarsBoard SD image. After a fex2bin the MarsBoard bootet from SD0. Life was beautiful. The problems start if I wanted to contact the eMMC. I changed "[nand_para] nand_used" to 0. And I changed "[mmc2_para] sdc_used" to 1. Then the kernel gets in serious problems: <6>[mmc-msg] sdc2 set ios: clk 52000000Hz bm PP pm ON vdd 3.3V width 1 timing MMC-HS(SDR20) dt B <6>[mmc-msg] sdc2 set round clock 46153846, src 600000000 <6>[mmc-msg] sdc2 set ios: clk 52000000Hz bm PP pm ON vdd 3.3V width 8 timing MMC-HS(SDR20) dt B <3>[mmc-err] smc 2 err, cmd 8, EBE <3>[mmc-err] In data read operation <6>[mmc-msg] found data error, need to send stop command <3>[mmc-err] sdc 2 send stop command failed <6>[mmc-msg] sdc2 set ios: clk 52000000Hz bm PP pm ON vdd 3.3V width 4 timing MMC-HS(SDR20) dt B <6>mmc1: new high speed MMC card at address 0001 <6>mmcblk1: mmc1:0001 MMC02G 1.78 GiB <6>mmcblk1boot0: mmc1:0001 MMC02G partition 1 1.00 MiB <6>mmcblk1boot1: mmc1:0001 MMC02G partition 2 1.00 MiB <3>[mmc-err] smc 2 err, cmd 18, RTO <3>[mmc-err] In data read operation <6>[mmc-msg] found data error, need to send stop command <3>mmcblk1: timed out sending r/w cmd command, card status 0x900 <3>mmcblk1: not retrying timeout <3>end_request: I/O error, dev mmcblk1, sector 0 <3>Buffer I/O error on device mmcblk1, logical block 0 <3>[mmc-err] smc 2 err, cmd 18, RTO <3>[mmc-err] In data read operation <6>[mmc-msg] found data error, need to send stop command <3>mmcblk1: timed out sending r/w cmd command, card status 0x900 <3>mmcblk1: not retrying timeout <3>end_request: I/O error, dev mmcblk1, sector 0 <3>Buffer I/O error on device mmcblk1, logical block 0 <3>[mmc-err] smc 2 err, cmd 18, RTO <3>[mmc-err] In data read operation <6>[mmc-msg] found data error, need to send stop command <3>mmcblk1: timed out sending r/w cmd command, card status 0x900 <3>mmcblk1: not retrying timeout <3>end_request: I/O error, dev mmcblk1, sector 0 <3>Buffer I/O error on device mmcblk1, logical block 0 <3>[mmc-err] smc 2 err, cmd 18, RTO <3>[mmc-err] In data read operation <6>[mmc-msg] found data error, need to send stop command <3>mmcblk1: timed out sending r/w cmd command, card status 0x900 <3>mmcblk1: not retrying timeout <3>end_request: I/O error, dev mmcblk1, sector 0 <3>Buffer I/O error on device mmcblk1, logical block 0 <3>[mmc-err] smc 2 err, cmd 18, RTO <3>[mmc-err] In data read operation <6>[mmc-msg] found data error, need to send stop command <3>mmcblk1: timed out sending r/w cmd command, card status 0x900 <3>mmcblk1: not retrying timeout <3>end_request: I/O error, dev mmcblk1, sector 0 <3>Buffer I/O error on device mmcblk1, logical block 0 <3>[mmc-err] smc 2 err, cmd 18, RTO <3>[mmc-err] In data read operation <6>[mmc-msg] found data error, need to send stop command <3>mmcblk1: timed out sending r/w cmd command, card status 0x900 <3>mmcblk1: not retrying timeout <3>end_request: I/O error, dev mmcblk1, sector 0 <3>Buffer I/O error on device mmcblk1, logical block 0 <3>[mmc-err] smc 2 err, cmd 18, RTO <3>[mmc-err] In data read operation <6>[mmc-msg] found data error, need to send stop command <3>mmcblk1: timed out sending r/w cmd command, card status 0x900 <3>mmcblk1: not retrying timeout <3>end_request: I/O error, dev mmcblk1, sector 0 <3>Buffer I/O error on device mmcblk1, logical block 0 Dev mmcblk1: unable to read RDB block 0 <3>[mmc-err] smc 2 err, cmd 18, RTO <3>[mmc-err] In data read operation <6>[mmc-msg] found data error, need to send stop command <3>mmcblk1: timed out sending r/w cmd command, card status 0x900 <3>mmcblk1: not retrying timeout <3>end_request: I/O error, dev mmcblk1, sector 0 <3>Buffer I/O error on device mmcblk1, logical block 0 <3>[mmc-err] smc 2 err, cmd 18, RTO <3>[mmc-err] In data read operation <6>[mmc-msg] found data error, need to send stop command <3>mmcblk1: timed out sending r/w cmd command, card status 0x900 <3>mmcblk1: not retrying timeout <3>end_request: I/O error, dev mmcblk1, sector 0 <3>Buffer I/O error on device mmcblk1, logical block 0 <3>[mmc-err] smc 2 err, cmd 18, RTO <3>[mmc-err] In data read operation <6>[mmc-msg] found data error, need to send stop command <3>mmcblk1: timed out sending r/w cmd command, card status 0x900 <3>mmcblk1: not retrying timeout <3>end_request: I/O error, dev mmcblk1, sector 0 <3>Buffer I/O error on device mmcblk1, logical block 0 <3>Dev Sunxi softw311 mmcblk1 header: error reading sector 0 <1>Unable to handle kernel NULL pointer dereference at virtual address 00000000 <1>pgd = c0004000 <1>[00000000] *pgd=00000000 <0>Internal error: Oops: 17 [#1] PREEMPT SMP ARM <d>Modules linked in: cpufreq_userspace 8188eu spidev a20_tp 8021q garp stp llc hidp rfcomm hci_uart bluetooth CPU: 1 Not tainted (3.4.108-lime #14) PC is at put_page+0x0/0x48 LR is at sunxi_nand311_partition+0x84/0x1f4 pc : [<c00b668c>] lr : [<c03dd618>] psr: 600d0013 sp : ef05bc68 ip : 0007ffff fp : 00000000 r10: 00000000 r9 : 00000000 r8 : 00000000 r7 : 00000000 r6 : ee208000 r5 : 00000001 r4 : 00000000 r3 : c0a26554 r2 : c0a26554 r1 : 600d0093 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment kernel Control: 10c5387d Table: 6e72006a DAC: 00000015 I must say that it is not 100% sure that soldering was performed correctly: though the person doing it is very capable soldering a BGA by hand is "blind work". OTOH the kernel says "mmcblk1: mmc1:0001 MMC02G 1.78 GiB" which indicates that the eMMC was seen. The line with "LR is at sunxi_nand311_partition" indicates to me that the sunxi nand driver may cause problems so my thought was to build the kernel with the CONFIG_SUNXI_NAND_PARTITION=n and CONFIG_SUNXI_NAND=n. Unfortunately this seems to cause even more problems: even U-Boot does not work anymore. The Olimex Lime2 (with different boot.scr and script.bin) has no problems with the same image. My questions: * Has anybody tried booting an A20 from SD2. * Has anybody tried accessing an eMMC from an A20? Thanks in advance, Guus