Hello, I am looking into the performance of the LS1021A between Linux and Barebox and a PPC P1014 I noticed the following on md5sum calculation on 1MB file; On Barebox, md5sum of a 1MB file in memory: barebox@LS1021A-IOT Board:/ time md5sum /file 27a45e1d2fc461638aafce09b6397841 /file time: 494ms The DDR is cacheable: barebox:/ mmuinfo 0x80000000 PAR result for 0x80000000: privileged read: 0x8000005c Physical Address [31:12]: 0x80000000 Reserved [11]: 0x0 Not Outer Shareable [10]: 0x0 Non-Secure [9]: 0x0 Impl. def. [8]: 0x0 Shareable [7]: 0x0 Inner mem. attr. [6:4]: 0x5 (0b101 Write-Back, Write-Allocate) Outer mem. attr. [3:2]: 0x3 (0b11 Write-Back, no Write-Allocate) SuperSection [1]: 0x0 Failure [0]: 0x0 privileged write: 0x8000005c Physical Address [31:12]: 0x80000000 Reserved [11]: 0x0 Not Outer Shareable [10]: 0x0 Non-Secure [9]: 0x0 Impl. def. [8]: 0x0 Shareable [7]: 0x0 Inner mem. attr. [6:4]: 0x5 (0b101 Write-Back, Write-Allocate) Outer mem. attr. [3:2]: 0x3 (0b11 Write-Back, no Write-Allocate) SuperSection [1]: 0x0 Failure [0]: 0x0 On a Freescale P1014 (PPC)with Barebox: time md5sum self1 f168af3541bc7109150e6be2f6c8cde4 self1 time: 57ms On Linux: [root@openware]# time md5sum /tmp/mtd0 26d8158619e5791859519654557aeeba /tmp/mtd0 real 0m0.029s user 0m0.025s sys 0m0.001s This is almost a 20 fold difference. >From my In-Circuit-Emulator, the cache is enabled on both Linux and Barebox. My guess it that it comes down how the MMU is used. Any input on how to speed up the boot loader would be appreciated. Cheers, Renaud
