Hi Arseniy, avkrasnov@xxxxxxxxxxxxxxxxx wrote on Tue, 7 May 2024 10:35:51 +0300: > On 07.05.2024 10:27, Miquel Raynal wrote: > > Hi Arseniy, > > > > avkrasnov@xxxxxxxxxxxxxxxxx wrote on Tue, 7 May 2024 09:53:06 +0300: > > > >> On 06.05.2024 16:48, Miquel Raynal wrote: > >>> Hi Arseniy, > >>> > >>> avkrasnov@xxxxxxxxxxxxxxxxx wrote on Tue, 16 Apr 2024 11:51:00 +0300: > >>> > >>>> Boot ROM code on Meson requires that some pages on NAND must be written > >>>> in special mode: "short" ECC mode where each block is 384 bytes and > >>>> scrambling mode is on. > >>> > >>> Ok > >>> > >>>> Such pages located with the specified interval within specified offset. > >>> > >>> I'm sorry I don't get that sentence. > >> > >> Sorry, I mean this (let me draw :) ) : > >> > >> [ page 0 ][ page 1 ][ page 2 ][ page 3 ][ page 4 ][ page 5 ][ page 6 ][ page 7 ][ page 8 ][ page 9 ] > >> > >> For example, we have 10 pages starting from the beginning of the chip - this is "within specified offset", > >> e.g. offset is 10. BootROM on axg needs that (for example) every third page must be written in "special" > >> mode: scrambling is on and ECC is 384 bytes. Such pages are 0, 2, 4, 6, 8. E.g. "specified interval" will > >> be 3. > > > > Shall be 2, no? > > yes, starting from 0 - then 2. e.g. > if (!(page_num % 2)) > boot ROM need this page > > > > >> > >> So: > >> > >> amlogic,boot-pages: 10 > >> amlogic,boot-page-step: 3 > > > > Ok I get it. Thanks for the explanation. I don't really understand the > > logic behind it though. Do you know why the bootROM would access only > > one page over 2 or 3? Is there a default value? Is this configurable? > > No, boot rom source is closed, I don't have access to it. I get this logic > from old version of vendor's uboot - in practice they use non 2 or 3, they > use hardcoded 128 step value. And amlogic,boot-pages is 1024 Feels like they are trying to use only the first page of each block, no? That's very weird but I understand better. Thanks, Miquèl
