Am 09.08.2017 um 20:58 schrieb Gaël PORTAY: > Hi, > > On Wed, Aug 09, 2017 at 08:05:57AM +0200, Oleksij Rempel wrote: >> Am 09.08.2017 um 06:13 schrieb Gaël PORTAY: >>> Dear maintainers, >>> >>> I came accross this issue when I was trying to add support for a new MIPS >>> board. >> >> Just out of curiosity, what MIPS board are you working on? If it is not >> a secret :) >> > > I am working on VoCore2[1]; it is a board based on a mediatek mt7628 CPU. > > I am doing this to learn myself how works barebox > > Offtopic: For now it is booting on a really really old version of u-boot. I am > able de boot barebox from u-boot. I had to hack the mips_disable_interrupts to > remove the reset of flag ERL in CP0; but I don't know why yet. This flag is > supposed to be set when CPU reboots; but because I am running barebox from a the > command go of u-boot, this flag is unset. > > Are you able to re-run barebox from barebox on your MIPS board? Yes, usually i prefer to make a binaries wich are able to start from RAM, Jtag and Flash. Currently we test if it is running from spi flash adn skip most of the low level init: https://github.com/olerem/barebox/blob/ar9344-2017.08.01.1/arch/mips/boards/tplink-mr3020/include/board/board_pbl_start.h#L29 On this board i decided to use SRAM for low level init testing: https://github.com/olerem/barebox/blob/ar9344-2017.08.01.1/arch/mips/boards/tplink-wdr4300/include/board/board_pbl_start.h#L38 > .macro mips_disable_interrupts > .set push > .set noreorder > mfc0 k0, CP0_STATUS > - li k1, ~(ST0_ERL | ST0_IE) > + li k1, ~ST0_IE > and k0, k1 > mtc0 k0, CP0_STATUS > .set pop > .endm > > For now, I have splitted mips_disable_interrupts into two macros. The second > macro mips_reset_error_level checks if the ERL flag is armed before resetting it > to 0. > > .macro mips_reset_error_level > .set push > .set noreorder > mfc0 k0, CP0_STATUS > li k1, ST0_ERL > and k1, k0 > bne k1, zero, 1f > li k1, ~(ST0_ERL) > and k0, k1 > mtc0 k0, CP0_STATUS > 1: .set pop > .endm > > But I don't know if this is the right thing to do. > > [1]: https://www.indiegogo.com/projects/vocore2-4-coin-sized-linux-computer-with-wifi#/ > -- Regards, Oleksij
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